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Ubuntu Security Notice USN-5787-1

Ubuntu Security Notice 5787-1 - It was discovered that Libksba incorrectly handled parsing CRL signatures. A remote attacker could use this issue to cause Libksba to crash, resulting in a denial of service, or possibly execute arbitrary code.

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==========================================================================
Ubuntu Security Notice USN-5787-1
January 05, 2023

libksba vulnerability

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

  • Ubuntu 22.10
  • Ubuntu 22.04 LTS
  • Ubuntu 20.04 LTS
  • Ubuntu 18.04 LTS

Summary:

Libksba could be made to crash or run programs if it processed specially
crafted data.

Software Description:

  • libksba: X.509 and CMS support library

Details:

It was discovered that Libksba incorrectly handled parsing CRL signatures.
A remote attacker could use this issue to cause Libksba to crash, resulting
in a denial of service, or possibly execute arbitrary code.

Update instructions:

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

Ubuntu 22.10:
libksba8 1.6.0-3ubuntu1.1

Ubuntu 22.04 LTS:
libksba8 1.6.0-2ubuntu0.2

Ubuntu 20.04 LTS:
libksba8 1.3.5-2ubuntu0.20.04.2

Ubuntu 18.04 LTS:
libksba8 1.3.5-2ubuntu0.18.04.2

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

References:
https://ubuntu.com/security/notices/USN-5787-1
CVE-2022-47629

Package Information:
https://launchpad.net/ubuntu/+source/libksba/1.6.0-3ubuntu1.1
https://launchpad.net/ubuntu/+source/libksba/1.6.0-2ubuntu0.2
https://launchpad.net/ubuntu/+source/libksba/1.3.5-2ubuntu0.20.04.2
https://launchpad.net/ubuntu/+source/libksba/1.3.5-2ubuntu0.18.04.2

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Ubuntu Security Notice 5787-2 - USN-5787-1 fixed vulnerabilities in Libksba. This update provides the corresponding updates for Ubuntu 16.04 ESM and Ubuntu 14.04 ESM. It was discovered that Libksba incorrectly handled parsing CRL signatures. A remote attacker could use this issue to cause Libksba to crash, resulting in a denial of service, or possibly execute arbitrary code.

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Gentoo Linux Security Advisory 202212-7 - An integer overflow vulnerability has been found in libksba which could result in remote code execution. Versions less than 1.6.3 are affected.

Debian Security Advisory 5305-1

Debian Linux Security Advisory 5305-1 - An integer overflow flaw was discovered in the CRL signature parser in libksba, an X.509 and CMS support library, which could result in denial of service or the execution of arbitrary code.

CVE-2022-47629: ⚓ T6284 Another integer overflow in Libksba

Libksba before 1.6.3 is prone to an integer overflow vulnerability in the CRL signature parser.

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