#VU67906 Double Free in OpenSSH

Vulnerability identifier: #VU67906

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: N/A

CWE-ID: CWE-415

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenSSH
Server applications / Remote management servers, RDP, SSH

Vendor: OpenSSH

Description

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

The vulnerability exists due to a boundary error in ssh-keysign(8) when reading files. A remote attacker can trick the victim into using a specially crafted file to trigger a double free error and crash the application.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

OpenSSH: 8.9p1 - 9.0p1

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External links
https://www.openssh.com/releasenotes.html#9.1

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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.