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Ubuntu Security Notice USN-6237-3

Ubuntu Security Notice 6237-3 - USN-6237-1 fixed several vulnerabilities in curl. This update provides the corresponding updates for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. Hiroki Kurosawa discovered that curl incorrectly handled validating certain certificate wildcards. A remote attacker could possibly use this issue to spoof certain website certificates using IDN hosts.

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#vulnerability#web#ubuntu#ssl

==========================================================================
Ubuntu Security Notice USN-6237-3
September 11, 2023

curl vulnerabilities

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

  • Ubuntu 18.04 LTS (Available with Ubuntu Pro)
  • Ubuntu 16.04 LTS (Available with Ubuntu Pro)
  • Ubuntu 14.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in curl.

Software Description:

  • curl: HTTP, HTTPS, and FTP client and client libraries

Details:

USN-6237-1 fixed several vulnerabilities in curl. This update provides the
corresponding updates for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and
Ubuntu 18.04 LTS.

Original advisory details:

Hiroki Kurosawa discovered that curl incorrectly handled validating
certain
certificate wildcards. A remote attacker could possibly use this issue to
spoof certain website certificates using IDN hosts. (CVE-2023-28321)

Hiroki Kurosawa discovered that curl incorrectly handled callbacks when
certain options are set by applications. This could cause applications
using curl to misbehave, resulting in information disclosure, or a denial
of service. (CVE-2023-28322)

It was discovered that curl incorrectly handled saving cookies to files. A
local attacker could possibly use this issue to create or overwrite files.
This issue only affected Ubuntu 22.10, and Ubuntu 23.04. (CVE-2023-32001)

Update instructions:

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
curl 7.58.0-2ubuntu3.24+esm1
libcurl3-gnutls 7.58.0-2ubuntu3.24+esm1
libcurl3-nss 7.58.0-2ubuntu3.24+esm1
libcurl4 7.58.0-2ubuntu3.24+esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
curl 7.47.0-1ubuntu2.19+esm9
libcurl3 7.47.0-1ubuntu2.19+esm9
libcurl3-gnutls 7.47.0-1ubuntu2.19+esm9
libcurl3-nss 7.47.0-1ubuntu2.19+esm9

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
curl 7.35.0-1ubuntu2.20+esm16
libcurl3 7.35.0-1ubuntu2.20+esm16
libcurl3-gnutls 7.35.0-1ubuntu2.20+esm16
libcurl3-nss 7.35.0-1ubuntu2.20+esm16

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-6237-3
https://ubuntu.com/security/notices/USN-6237-1
CVE-2023-28321, CVE-2023-28322

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Ubuntu Security Notice USN-6237-2

Ubuntu Security Notice 6237-2 - USN-6237-1 fixed vulnerabilities in curl. The update caused a certificate wildcard handling regression on Ubuntu 22.04 LTS. This update fixes the problem. Hiroki Kurosawa discovered that curl incorrectly handled validating certain certificate wildcards. A remote attacker could possibly use this issue to spoof certain website certificates using IDN hosts. Hiroki Kurosawa discovered that curl incorrectly handled callbacks when certain options are set by applications. This could cause applications using curl to misbehave, resulting in information disclosure, or a denial of service. It was discovered that curl incorrectly handled saving cookies to files. A local attacker could possibly use this issue to create or overwrite files. This issue only affected Ubuntu 22.10, and Ubuntu 23.04.

Ubuntu Security Notice USN-6237-2

Ubuntu Security Notice 6237-2 - USN-6237-1 fixed vulnerabilities in curl. The update caused a certificate wildcard handling regression on Ubuntu 22.04 LTS. This update fixes the problem. Hiroki Kurosawa discovered that curl incorrectly handled validating certain certificate wildcards. A remote attacker could possibly use this issue to spoof certain website certificates using IDN hosts. Hiroki Kurosawa discovered that curl incorrectly handled callbacks when certain options are set by applications. This could cause applications using curl to misbehave, resulting in information disclosure, or a denial of service. It was discovered that curl incorrectly handled saving cookies to files. A local attacker could possibly use this issue to create or overwrite files. This issue only affected Ubuntu 22.10, and Ubuntu 23.04.

Ubuntu Security Notice USN-6237-1

Ubuntu Security Notice 6237-1 - Hiroki Kurosawa discovered that curl incorrectly handled validating certain certificate wildcards. A remote attacker could possibly use this issue to spoof certain website certificates using IDN hosts. Hiroki Kurosawa discovered that curl incorrectly handled callbacks when certain options are set by applications. This could cause applications using curl to misbehave, resulting in information disclosure, or a denial of service.

CVE-2023-28322

An information disclosure vulnerability exists in curl <v8.1.0 when doing HTTP(S) transfers, libcurl might erroneously use the read callback (`CURLOPT_READFUNCTION`) to ask for data to send, even when the `CURLOPT_POSTFIELDS` option has been set, if the same handle previously wasused to issue a `PUT` request which used that callback. This flaw may surprise the application and cause it to misbehave and either send off the wrong data or use memory after free or similar in the second transfer. The problem exists in the logic for a reused handle when it is (expected to be) changed from a PUT to a POST.

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