Vulnerability identifier: #VU68376

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-3515

CWE-ID: CWE-190

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libksba
Other software / Other software solutions

Vendor: GnuPG Project

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to integer overflow within the CRL parser in libksba. A remote attacker can pass specially crafted data to the application, trigger an integer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

libksba: 0.9.13 - 1.6.1

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External links
http://gnupg.org/blog/20221017-pepe-left-the-ksba.html
http://www.zerodayinitiative.com/advisories/ZDI-22-1465/
http://www.zerodayinitiative.com/advisories/ZDI-22-1464/
http://www.zerodayinitiative.com/advisories/ZDI-22-1463/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.