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Ubuntu Security Notice USN-6937-1
July 31, 2024

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

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in OpenSSL.

Software Description:
- openssl: Secure Socket Layer (SSL) cryptographic library and tools

Details:

It was discovered that OpenSSL incorrectly handled TLSv1.3 sessions when
certain non-default TLS server configurations were in use. A remote
attacker could possibly use this issue to cause OpenSSL to consume
resources, leading to a denial of service. (CVE-2024-2511)

It was discovered that OpenSSL incorrectly handled checking excessively
long DSA keys or parameters. A remote attacker could possibly use this
issue to cause OpenSSL to consume resources, leading to a denial of
service. This issue only affected Ubuntu 22.04 LTS and Ubuntu 24.04 LTS.
(CVE-2024-4603)

William Ahern discovered that OpenSSL incorrectly handled certain memory
operations in a rarely-used API. A remote attacker could use this issue to
cause OpenSSL to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2024-4741)

Joseph Birr-Pixton discovered that OpenSSL incorrectly handled calling a
certain API with an empty supported client protocols buffer. A remote
attacker could possibly use this issue to obtain sensitive information, or
cause OpenSSL to crash, resulting in a denial of service. (CVE-2024-5535)

Update instructions:

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

Ubuntu 24.04 LTS
   libssl3t64                      3.0.13-0ubuntu3.2

Ubuntu 22.04 LTS
   libssl3                         3.0.2-0ubuntu1.17

Ubuntu 20.04 LTS
   libssl1.1                       1.1.1f-1ubuntu2.23

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

References:
   https://ubuntu.com/security/notices/USN-6937-1
   CVE-2024-2511, CVE-2024-4603, CVE-2024-4741, CVE-2024-5535

Package Information:
   https://launchpad.net/ubuntu/+source/openssl/3.0.13-0ubuntu3.2
   https://launchpad.net/ubuntu/+source/openssl/3.0.2-0ubuntu1.17
   https://launchpad.net/ubuntu/+source/openssl/1.1.1f-1ubuntu2.23