A vulnerability has been found in OpenSSL up to 1.1.1x/3.0.13/3.1.5/3.2.1 and classified as critical. This vulnerability affects some unknown processing of the component TLSv1.3 Handler. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes:

Issue summary: Some non-default TLS server configurations can cause unbounded memory growth when processing TLSv1.3 sessions Impact summary: An attacker may exploit certain server configurations to trigger unbounded memory growth that would lead to a Denial of Service This problem can occur in TLSv1.3 if the non-default SSL_OP_NO_TICKET option is being used (but not if early_data support is also configured and the default anti-replay protection is in use). In this case, under certain conditions, the session cache can get into an incorrect state and it will fail to flush properly as it fills. The session cache will continue to grow in an unbounded manner. A malicious client could deliberately create the scenario for this failure to force a Denial of Service. It may also happen by accident in normal operation. This issue only affects TLS servers supporting TLSv1.3. It does not affect TLS clients. The FIPS modules in 3.2, 3.1 and 3.0 are not affected by this issue. OpenSSL 1.0.2 is also not affected by this issue.

The weakness was disclosed by Manish Patidar. The advisory is available at openssl.org. This vulnerability was named CVE-2024-2511 since 03/15/2024. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 04/08/2024). This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 1.1.1y, 3.0.14, 3.1.6 or 3.2.2 eliminates this vulnerability. Applying the patch 7e4d731b1c07201ad9374c1cd9ac5263bdf35bce is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The entries VDB-234166, VDB-235010, VDB-235807 and VDB-239241 are pretty similar.

Productinfo

Type

• Network Encryption Software

Name

• OpenSSL

Version

• 1.1.1x
• 3.0.0
• 3.0.1
• 3.0.2
• 3.0.3
• 3.0.4
• 3.0.5
• 3.0.6
• 3.0.7
• 3.0.8
• 3.0.9
• 3.0.10
• 3.0.11
• 3.0.12
• 3.0.13
• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4
• 3.1.5
• 3.2.0
• 3.2.1

License

• open-source

CPE 2.3info

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CPE 2.2info

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CVSSv3info

CVSSv2info

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