Vulnerability identifier: #VU84540

Vulnerability risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-6918

CWE-ID: CWE-252

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libssh
Universal components / Libraries / Libraries used by multiple products

Vendor: libssh

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to libssh does not check for returned values of message digest (MD) operations in low memory conditions. A remote attacker can terminate the connection or force the library to use weak keys.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

libssh: 0.3.0 - 0.10.5

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External links
http://bugzilla.redhat.com/show_bug.cgi?id=2254997
http://www.libssh.org/2023/12/18/libssh-0-10-6-and-libssh-0-9-8-security-releases/
http://www.libssh.org/security/advisories/CVE-2023-6918.txt

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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.