MEDIUM 6.5 Microsoft PoC
CVE-2023-25136
OpenSSH server (sshd) 9.1 introduced a double-free vulnerability during options.kex_algorithms handling. This is fixed in OpenSSH 9.2. The double free can be leveraged, by an unauthenticated remote attacker in the default configuration, to jump to any location in the sshd address space. One third-party report states "remote code execution is theoretically possible."
Microsoft Security Update 2023-Feb: OpenSSH server (sshd) 9.1 introduced a double-free vulnerability during options.kex_algorithms handling. This is fixed in OpenSSH 9.2. The double free can be leveraged, by an unauthenticated remote attacker in the default configuration, to jump to any location in the sshd address space. One third-party report states "remote code execution is theoretically possible."
Affected Products
- cm1 openssh 8.9p1-3 on CBL Mariner 1.0
- cbl2 openssh 8.9p1-8 on CBL Mariner 2.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-25136
- https://nvd.nist.gov/vuln/detail/CVE-2023-25136
This medium severity vulnerability with a CVSS score of 6.5 was published on 2023-02-14 via Microsoft. 🚨 A public proof-of-concept exploit is available on GitHub. EPSS score: 89.7% (top 0% of all CVEs by exploitation probability). Affected: cm1 openssh 8.9p1-3 on CBL Mariner 1.0, cbl2 openssh 8.9p1-8 on CBL Mariner 2.0.
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