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Ubuntu Security Notice USN-5502-1

Ubuntu Security Notice 5502-1 - Alex Chernyakhovsky discovered that OpenSSL incorrectly handled AES OCB mode when using the AES-NI assembly optimized implementation on 32-bit x86 platforms. A remote attacker could possibly use this issue to obtain sensitive information.

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#vulnerability#ubuntu#ssl

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Ubuntu Security Notice USN-5502-1
July 05, 2022

openssl vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 22.04 LTS
  • Ubuntu 21.10
  • Ubuntu 20.04 LTS
  • Ubuntu 18.04 LTS

Summary:

OpenSSL could be made to expose sensitive information over the network.

Software Description:

  • openssl: Secure Socket Layer (SSL) cryptographic library and tools

Details:

Alex Chernyakhovsky discovered that OpenSSL incorrectly handled AES OCB
mode when using the AES-NI assembly optimized implementation on 32-bit
x86 platforms. A remote attacker could possibly use this issue to obtain
sensitive information.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 22.04 LTS:
libssl3 3.0.2-0ubuntu1.6

Ubuntu 21.10:
libssl1.1 1.1.1l-1ubuntu1.6

Ubuntu 20.04 LTS:
libssl1.1 1.1.1f-1ubuntu2.16

Ubuntu 18.04 LTS:
libssl1.1 1.1.1-1ubuntu2.1~18.04.20

After a standard system update you need to reboot your computer to make all
the necessary changes.

References:
https://ubuntu.com/security/notices/USN-5502-1
CVE-2022-2097

Package Information:
https://launchpad.net/ubuntu/+source/openssl/3.0.2-0ubuntu1.6
https://launchpad.net/ubuntu/+source/openssl/1.1.1l-1ubuntu1.6
https://launchpad.net/ubuntu/+source/openssl/1.1.1f-1ubuntu2.16
https://launchpad.net/ubuntu/+source/openssl/1.1.1-1ubuntu2.1~18.04.20

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AES OCB mode for 32-bit x86 platforms using the AES-NI assembly optimised implementation will not encrypt the entirety of the data under some circumstances. This could reveal sixteen bytes of data that was preexisting in the memory that wasn't written. In the special case of "in place" encryption, sixteen bytes of the plaintext would be revealed. Since OpenSSL does not support OCB based cipher suites for TLS and DTLS, they are both unaffected.

CVE-2022-2097

AES OCB mode for 32-bit x86 platforms using the AES-NI assembly optimised implementation will not encrypt the entirety of the data under some circumstances. This could reveal sixteen bytes of data that was preexisting in the memory that wasn't written. In the special case of "in place" encryption, sixteen bytes of the plaintext would be revealed. Since OpenSSL does not support OCB based cipher suites for TLS and DTLS, they are both unaffected. Fixed in OpenSSL 3.0.5 (Affected 3.0.0-3.0.4). Fixed in OpenSSL 1.1.1q (Affected 1.1.1-1.1.1p).

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