CVE-2023-25136
MEDIUMCVSS 6.5/10EPSS 89.95%
Last modified
CVE-2023-25136 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. OpenSSH server (sshd) 9.1 introduced a double-free vulnerability during options.kex_algorithms handling. This is fixed in OpenSSH 9.2. EPSS estimates a 89.95% chance of exploitation in the next 30 days.
Description
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."
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Openbsd | Openssh | 9.1 |
| Fedoraproject | Fedora | 37 |
| Fedoraproject | Fedora | 38 |
| Netapp | Ontap Select Deploy Administration Utility | All versions |
| Netapp | A250 Firmware | All versions |
| Netapp | 500f Firmware | All versions |
| Netapp | C250 Firmware | All versions |
References
- http://www.openwall.com/lists/oss-security/2023/02/13/1Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/02/22/1Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/02/22/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/02/23/3Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/03/06/1Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/03/09/2Mailing List, Third Party Advisory
- https://bugzilla.mindrot.org/show_bug.cgi?id=3522Exploit, Issue Tracking, Third Party Advisory
- https://ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/017_sshd.patch.sigPatch, Vendor Advisory
- https://github.com/openssh/openssh-portable/commit/486c4dc3b83b4b67d663fb0fa62bc24138ec3946Patch, Third Party Advisory
- https://jfrog.com/blog/openssh-pre-auth-double-free-cve-2023-25136-writeup-and-proof-of-concept/Exploit, Third Party Advisory
- https://news.ycombinator.com/item?id=34711565Issue Tracking, Third Party Advisory
- https://security.gentoo.org/glsa/202307-01Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230309-0003/Third Party Advisory
- https://www.openwall.com/lists/oss-security/2023/02/02/2Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/02/13/1Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/02/22/1Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/02/22/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/02/23/3Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/03/06/1Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/03/09/2Mailing List, Third Party Advisory
- https://bugzilla.mindrot.org/show_bug.cgi?id=3522Exploit, Issue Tracking, Third Party Advisory
- https://ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/017_sshd.patch.sigPatch, Vendor Advisory
- https://github.com/openssh/openssh-portable/commit/486c4dc3b83b4b67d663fb0fa62bc24138ec3946Patch, Third Party Advisory
- https://jfrog.com/blog/openssh-pre-auth-double-free-cve-2023-25136-writeup-and-proof-of-concept/Exploit, Third Party Advisory
- https://news.ycombinator.com/item?id=34711565Issue Tracking, Third Party Advisory
- https://security.gentoo.org/glsa/202307-01Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230309-0003/Third Party Advisory
- https://www.openwall.com/lists/oss-security/2023/02/02/2Exploit, Mailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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."
How severe is CVE-2023-25136?
CVE-2023-25136 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 89.95% probability of exploitation in the next 30 days.
How do I fix CVE-2023-25136?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2023-25136?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST