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CVE-2020-13777: gnutls.org

GnuTLS 3.6.x before 3.6.14 uses incorrect cryptography for encrypting a session ticket (a loss of confidentiality in TLS 1.2, and an authentication bypass in TLS 1.3). The earliest affected version is 3.6.4 (2018-09-24) because of an error in a 2018-09-18 commit. Until the first key rotation, the TLS server always uses wrong data in place of an encryption key derived from an application.

CVE
#vulnerability#google#red_hat#dos#auth#ssl

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Description

Information

GNUTLS-SA-2022-07-07

N/A

Severity Medium; memory corruption

When gnutls_pkcs7_verify cannot verify signature against given trust list, it starts creating a chain of certificates starting from identified signer up to known root. During the creation of this chain the signer certificate gets freed which results in double free when the same signer certificate is freed at the end of the algorithm. This affects GnuTLS 3.6.0 to 3.7.6. The issue was reported in the issue tracker as #1383.
Recommendation: To address the issue found upgrade to GnuTLS 3.7.7 or later versions.

GNUTLS-SA-2022-01-17

N/A

Severity Low; memory corruption

When a single trust list object is shared among multiple threads, calls to gnutls_x509_trust_list_verify_crt2() was able to corrupt temporary memory where internal copy of an issuer certificate is stored. The code path is only taken when a PKCS#11 based trust store is enabled and the issuer certificate is already stored as trusted. This affects GnuTLS 3.7.0 to 3.7.2. The issue was reported in the issue tracker as #1277.
Recommendation: To address the issue found upgrade to GnuTLS 3.7.3 or later versions.

GNUTLS-SA-2021-03-10

CVE-2021-20231, CVE-2021-20232

Severity Low; use-after-free

It was found that the client sending a “key_share” or “pre_share_key” extension may result in dereferencing a pointer no longer valid after realloc(). This only happens in TLS 1.3 and only when the client sends a large Client Hello message, e.g., when HRR is sent in a resumed session previously negotiated large FFDHE parameters, because the initial allocation of the buffer is large enough without having to call realloc(). The issue was reported in the issue tracker as #1151.
Recommendation: To address the issue found upgrade to GnuTLS 3.7.1 or later versions.

GNUTLS-SA-2020-09-04

CVE-2020-24659

Severity Moderate; null-pointer dereference

It was found by oss-fuzz that the server sending a “no_renegotiation” alert in an unexpected timing, followed by an invalid second handshake can cause a TLS 1.3 client to crash via a null-pointer dereference. The crash happens in the application’s error handling path, where the gnutls_deinit function is called after detecting a handshake failure. The issue was reported in the issue tracker as #1071.
Recommendation: To address the issue found upgrade to GnuTLS 3.6.15 or later versions.

GNUTLS-SA-2020-07-14

CVE-2023-0361

Severity Medium; timing sidechannel in RSA decryption

A vulnerability was found that the response times to malformed RSA ciphertexts in ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding. Only TLS ciphertext processing is affected. The issue was reported in the issue tracker as #1050.
Recommendation: To address the issue found upgrade to GnuTLS 3.8.0 or later versions.

GNUTLS-SA-2020-06-03

CVE-2020-13777

Severity High; flaw in TLS session ticket key construction

  • It was found that GnuTLS 3.6.4 introduced a regression in the TLS protocol implementation. This caused the TLS server to not securely construct a session ticket encryption key considering the application supplied secret, allowing a MitM attacker to bypass authentication in TLS 1.3 and recover previous conversations in TLS 1.2. See #1011 for more discussion on the topic.
    Recommendation: To address the issue found upgrade to GnuTLS 3.6.14 or later versions.

GNUTLS-SA-2020-03-31

CVE-2020-11501

Severity High; flaw in DTLS protocol implementation

  • It was found that GnuTLS 3.6.3 introduced a regression in the DTLS protocol implementation. This caused the DTLS client to not contribute any randomness to the DTLS negotiation breaking the security guarantees of the DTLS protocol. See #960 for more discussion on the topic.
    Recommendation: To address the issue found upgrade to GnuTLS 3.6.13 or later versions.

GNUTLS-SA-2019-03-27

CVE-2019-3836 CVE-2019-3829

Severity High; invalid pointer access, double free

  • It was found using the TLS fuzzer tools that decoding a malformed TLS1.3 asynchronous message can cause a server crash via an invalid pointer access. The issue affects GnuTLS server applications since 3.6.4. The issue was reported in issue tracker as #704.
  • Tavis Ormandy from Google Project Zero found a memory corruption (double free) vulnerability in the certificate verification API. Any client or server application that verifies X.509 certificates with GnuTLS 3.5.8 or later is affected. The issue was reported in issue tracker as #694.

Recommendation: To address the issues found upgrade to GnuTLS 3.6.7 or later versions.

GNUTLS-SA-2017-06-16

CVE-2017-7507

Severity High; null pointer dereference

It was found using the TLS fuzzer tools that decoding a status response TLS extension with valid contents could lead to a crash due to a null pointer dereference. The issue affects GnuTLS server applications. The issue was fixed in 3.5.13.
Recommendation: To address the issues found upgrade to GnuTLS 3.5.13 or later versions.

GNUTLS-SA-2017-03-25

CVE-2017-5335 CVE-2017-5336 CVE-2017-5337

Severity High; memory corruption

It was found using the OSS-FUZZ fuzzer infrastructure that decoding a specially crafted OpenPGP certificate could lead to heap and stack overflows. This affects only few applications which enable the OpenPGP certificate functionality of GnuTLS. This issue was fixed in GnuTLS 3.3.26 and 3.5.8.
Recommendation: The support of OpenPGP certificates in GnuTLS is considered obsolete. As such, it is not recommended to use OpenPGP certificates with GnuTLS. To address the issues found upgrade to GnuTLS 3.3.26, 3.5.8 or later versions.

GNUTLS-SA-2017-03-24

CVE-2017-5334

Severity High; memory corruption

It was found using the OSS-FUZZ fuzzer infrastructure that decoding a specially crafted X.509 certificate with Proxy Certificate Information extension present could lead to a double free. This issue was fixed in GnuTLS 3.3.26 and 3.5.8.
Recommendation: Upgrade to GnuTLS 3.3.26, 3.5.8 or later versions.

GNUTLS-SA-2015-02-09

CVE-2015-3308

Severity High; memory corruption

Robert Święcki reported that decoding a specially crafted certificate with certain CRL distribution points format can lead to a double free. This issue was fixed in GnuTLS 3.3.14. Recommendation: Upgrade to GnuTLS 3.3.14, or later versions.

GNUTLS-SA-2014-06-03

CVE-2014-0092

Severity High; certificate verification issue

A vulnerability was discovered that affects the certificate verification functions of all gnutls versions. A specially crafted certificate could bypass certificate validation checks. The vulnerability was discovered during an audit of GnuTLS for Red Hat.

Who is affected by this attack?

  • Anyone using certificate authentication in any version of GnuTLS.

How are past sessions affected?

  • The vulnerability to be exploited it requires an active man-in-the-middle attacker. Past sessions are not affected unless they were under such an attack.

How to mitigate the attack?

  • Upgrade to the latest GnuTLS version (3.2.12 or 3.1.22), or apply the patch for GnuTLS 2.12.x.

GNUTLS-SA-2009-08-12

CVE-2009-2730

Severity High; false positive in certificate hostname validation

Announcement of v2.8.3 that solves the problem.
Analysis of the vulnerability and minimal patch.
How to check if your GnuTLS library is vulnerable.
Back-ported patches for earlier releases: [1] [2]
Recommendation: Upgrade to GnuTLS 2.8.3 or later.

GNUTLS-SA-2008-08-08

CVE-2008-2377

Severity High; Denial of service on client side

Announcement
Detailed analysis and patch
Another report that suggest it can be exploited by hostile servers
Recommendation: Upgrade to GnuTLS 2.4.1 or apply the patch.

GNUTLS-SA-2008-05-21

CERT-FI announcement
CVE-2008-1948, CVE-2008-1949, CVE-2008-1950

Severity High; Memory corruption

Announcement and Patch
Updated announcement and Patch
Recommendation: Upgrade to GnuTLS 2.2.5 or apply the patch in the second link.

GNUTLS-SA-2006-02-06

CVE-2006-0645

Severity High; Memory corruption

Libtasn1 Announcement
Recommendation: Upgrade to Libtasn1 0.2.18 and GnuTLS 1.2.10 (stable) or 1.3.4 (experimental).

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CVE-2023-21954: Oracle Critical Patch Update Advisory - April 2023

Vulnerability in the Oracle Java SE, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Hotspot). Supported versions that are affected are Oracle Java SE: 8u361, 8u361-perf, 11.0.18, 17.0.6; Oracle GraalVM Enterprise Edition: 20.3.9, 21.3.5 and 22.3.1. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle Java SE, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability can also be exploited by using APIs in the specified Component, e.g., through...

RHSA-2023:1569: Red Hat Security Advisory: gnutls security and bug fix update

An update for gnutls is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original. Related CVEs: * CVE-2023-0361: A timing side-channel vulnerability was found in RSA ClientKeyExchange messages in GnuTLS. This side-channel may be sufficient to recover the key encrypted in the RSA ciphertext across a network in a Bleichenbacher style attack. To achieve a successful decryption, the attacker would need to send a large amount of specially crafted messages to the v...

Red Hat Security Advisory 2023-1200-01

Red Hat Security Advisory 2023-1200-01 - The gnutls packages provide the GNU Transport Layer Security library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.

RHSA-2023:1200: Red Hat Security Advisory: gnutls security and bug fix update

An update for gnutls is now available for Red Hat Enterprise Linux 9.0 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original. Related CVEs: * CVE-2023-0361: A timing side-channel vulnerability was found in RSA ClientKeyExchange messages in GnuTLS. This side-channel may be sufficient to recover the key encrypted in the RSA ciphertext across a network in a Bleichenbacher style attack. To achieve a successful decryption, the attacker would need to send a large amount of specially...

Red Hat Security Advisory 2023-1141-01

Red Hat Security Advisory 2023-1141-01 - The gnutls packages provide the GNU Transport Layer Security library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.

RHSA-2023:1141: Red Hat Security Advisory: gnutls security and bug fix update

An update for gnutls is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original. Related CVEs: * CVE-2023-0361: A timing side-channel vulnerability was found in RSA ClientKeyExchange messages in GnuTLS. This side-channel may be sufficient to recover the key encrypted in the RSA ciphertext across a network in a Bleichenbacher style attack. To achieve a successful decryption, the attacker would need to send a large amount of specially crafted messages to the v...

Ubuntu Security Notice USN-5901-1

Ubuntu Security Notice 5901-1 - Hubert Kario discovered that GnuTLS had a timing side-channel when handling certain RSA messages. A remote attacker could possibly use this issue to recover sensitive information.

Debian Security Advisory 5349-1

Debian Linux Security Advisory 5349-1 - Hubert Kario discovered a timing side channel in the RSA decryption implementation of the GNU TLS library.

CVE-2023-0361: Timing sidechannel in RSA decryption (#1050) · Issues · gnutls / GnuTLS · GitLab

A timing side-channel in the handling of RSA ClientKeyExchange messages was discovered in GnuTLS. This side-channel can be sufficient to recover the key encrypted in the RSA ciphertext across a network in a Bleichenbacher style attack. To achieve a successful decryption the attacker would need to send a large amount of specially crafted messages to the vulnerable server. By recovering the secret from the ClientKeyExchange message, the attacker would be able to decrypt the application data exchanged over that connection.

Red Hat Security Advisory 2022-6526-01

Red Hat Security Advisory 2022-6526-01 - OpenShift Virtualization is Red Hat's virtualization solution designed for Red Hat OpenShift Container Platform. This advisory contains the following OpenShift Virtualization 4.11.0 images: RHEL-8-CNV-4.11. Issues addressed include denial of service, memory leak, and out of bounds read vulnerabilities.

Red Hat Security Advisory 2022-6526-01

Red Hat Security Advisory 2022-6526-01 - OpenShift Virtualization is Red Hat's virtualization solution designed for Red Hat OpenShift Container Platform. This advisory contains the following OpenShift Virtualization 4.11.0 images: RHEL-8-CNV-4.11. Issues addressed include denial of service, memory leak, and out of bounds read vulnerabilities.

RHSA-2022:6526: Red Hat Security Advisory: OpenShift Virtualization 4.11.0 Images security and bug fix update

Red Hat OpenShift Virtualization release 4.11.0 is now available with updates to packages and images that fix several bugs and add enhancements. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original. Related CVEs: * CVE-2021-38561: golang: out-of-bounds read in golang.org/x/text/language leads to DoS * CVE-2021-44716: golang: net/http: limit growth of header canonicalization cache * CVE-2021-44717: golang: syscall: don't close fd 0 on ForkExec error * CVE-2022-1798: kubeVirt: Arbitrary file read on t...

RHSA-2022:6526: Red Hat Security Advisory: OpenShift Virtualization 4.11.0 Images security and bug fix update

Red Hat OpenShift Virtualization release 4.11.0 is now available with updates to packages and images that fix several bugs and add enhancements. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original. Related CVEs: * CVE-2021-38561: golang: out-of-bounds read in golang.org/x/text/language leads to DoS * CVE-2021-44716: golang: net/http: limit growth of header canonicalization cache * CVE-2021-44717: golang: syscall: don't close fd 0 on ForkExec error * CVE-2022-1798: kubeVirt: Arbitrary file read on t...

Red Hat Security Advisory 2022-6429-01

Red Hat Security Advisory 2022-6429-01 - The Migration Toolkit for Containers enables you to migrate Kubernetes resources, persistent volume data, and internal container images between OpenShift Container Platform clusters, using the MTC web console or the Kubernetes API. Issues addressed include bypass, code execution, and denial of service vulnerabilities.

Red Hat Security Advisory 2022-6429-01

Red Hat Security Advisory 2022-6429-01 - The Migration Toolkit for Containers enables you to migrate Kubernetes resources, persistent volume data, and internal container images between OpenShift Container Platform clusters, using the MTC web console or the Kubernetes API. Issues addressed include bypass, code execution, and denial of service vulnerabilities.

RHSA-2022:6429: Red Hat Security Advisory: Migration Toolkit for Containers (MTC) 1.7.4 security and bug fix update

The Migration Toolkit for Containers (MTC) 1.7.4 is now available. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original. Related CVEs: * CVE-2020-28500: nodejs-lodash: ReDoS via the toNumber, trim and trimEnd functions * CVE-2021-23337: nodejs-lodash: command injection via template * CVE-2022-0512: nodejs-url-parse: authorization bypass through user-controlled key * CVE-2022-0639: npm-url-parse: Authorization Bypass Through User-Controlled Key * CVE-2022-0686: npm-url-parse: Authorization bypass thr...

RHSA-2022:6429: Red Hat Security Advisory: Migration Toolkit for Containers (MTC) 1.7.4 security and bug fix update

The Migration Toolkit for Containers (MTC) 1.7.4 is now available. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original. Related CVEs: * CVE-2020-28500: nodejs-lodash: ReDoS via the toNumber, trim and trimEnd functions * CVE-2021-23337: nodejs-lodash: command injection via template * CVE-2022-0512: nodejs-url-parse: authorization bypass through user-controlled key * CVE-2022-0639: npm-url-parse: Authorization Bypass Through User-Controlled Key * CVE-2022-0686: npm-url-parse: Authorization bypass thr...

Red Hat Security Advisory 2022-5069-01

Red Hat Security Advisory 2022-5069-01 - Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. This advisory contains the container images for Red Hat OpenShift Container Platform 4.11.0. Issues addressed include code execution, cross site scripting, denial of service, information leakage, and traversal vulnerabilities.

Red Hat Security Advisory 2022-5069-01

Red Hat Security Advisory 2022-5069-01 - Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. This advisory contains the container images for Red Hat OpenShift Container Platform 4.11.0. Issues addressed include code execution, cross site scripting, denial of service, information leakage, and traversal vulnerabilities.

Red Hat Security Advisory 2022-5070-01

Red Hat Security Advisory 2022-5070-01 - Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. This advisory contains the RPM packages for Red Hat OpenShift Container Platform 4.11.0. Issues addressed include denial of service, out of bounds read, and traversal vulnerabilities.

Red Hat Security Advisory 2022-5070-01

Red Hat Security Advisory 2022-5070-01 - Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. This advisory contains the RPM packages for Red Hat OpenShift Container Platform 4.11.0. Issues addressed include denial of service, out of bounds read, and traversal vulnerabilities.

RHSA-2022:5069: Red Hat Security Advisory: OpenShift Container Platform 4.11.0 bug fix and security update

Red Hat OpenShift Container Platform release 4.11.0 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red Hat OpenShift Container Platform 4.11. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original. Related CVEs: * CVE-2021-23566: nanoid: Information disclosure via valueOf() function * CVE-2021-23648: sanitize-url: XSS * CVE-2021-41190: opencontainers: OCI manifest and index parsing confusion * CVE-2021-44906:...

RHSA-2022:5069: Red Hat Security Advisory: OpenShift Container Platform 4.11.0 bug fix and security update

Red Hat OpenShift Container Platform release 4.11.0 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red Hat OpenShift Container Platform 4.11. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original. Related CVEs: * CVE-2021-23566: nanoid: Information disclosure via valueOf() function * CVE-2021-23648: sanitize-url: XSS * CVE-2021-41190: opencontainers: OCI manifest and index parsing confusion * CVE-2021-44906:...

CVE-2022-21496: Oracle Critical Patch Update Advisory - April 2022

Vulnerability in the Oracle Java SE, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JNDI). Supported versions that are affected are Oracle Java SE: 7u331, 8u321, 11.0.14, 17.0.2, 18; Oracle GraalVM Enterprise Edition: 20.3.5, 21.3.1 and 22.0.0.2. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability can also be exploited by using APIs in the specified Component, e.g., through a web service ...

CVE-2022-21496: Oracle Critical Patch Update Advisory - April 2022

Vulnerability in the Oracle Java SE, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JNDI). Supported versions that are affected are Oracle Java SE: 7u331, 8u321, 11.0.14, 17.0.2, 18; Oracle GraalVM Enterprise Edition: 20.3.5, 21.3.1 and 22.0.0.2. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability can also be exploited by using APIs in the specified Component, e.g., through a web service ...

CVE-2020-24659: CVE-2020-24659: read-heap-buffer-overflow found by fuzz (#1071) · Issues · gnutls / GnuTLS · GitLab

An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.

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