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 6.5/10
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a | n/a |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.0, < V3.1.5 |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.0, < V3.1.5 |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.0, < V3.1.5 |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.0, < V3.1.5 |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.0, < V3.1.5 |
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://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JGAUIXJ3TEKCRKVWFQ6GDAGQFTIIGQQP/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7LKQDFZWKYHQ65TBSH2X2HJQ4V2THS3/
- 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://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JGAUIXJ3TEKCRKVWFQ6GDAGQFTIIGQQP/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7LKQDFZWKYHQ65TBSH2X2HJQ4V2THS3/
- 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
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
Timeline
- Published
- Feb 3, 2023
- Last modified
- Oct 14, 2026
- NVD status
- Modified