CVE-2023-25136

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."

References

https://www.openwall.com/lists/oss-security/2023/02/02/2

https://security.netapp.com/advisory/ntap-20230309-0003/

https://security.gentoo.org/glsa/202307-01

https://news.ycombinator.com/item?id=34711565

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7LKQDFZWKYHQ65TBSH2X2HJQ4V2THS3/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JGAUIXJ3TEKCRKVWFQ6GDAGQFTIIGQQP/

https://jfrog.com/blog/openssh-pre-auth-double-free-cve-2023-25136-writeup-and-proof-of-concept/

https://github.com/openssh/openssh-portable/commit/486c4dc3b83b4b67d663fb0fa62bc24138ec3946

https://ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/017_sshd.patch.sig

https://bugzilla.mindrot.org/show_bug.cgi?id=3522

http://www.openwall.com/lists/oss-security/2023/03/09/2

http://www.openwall.com/lists/oss-security/2023/03/06/1

http://www.openwall.com/lists/oss-security/2023/02/23/3

http://www.openwall.com/lists/oss-security/2023/02/22/2

http://www.openwall.com/lists/oss-security/2023/02/22/1

http://www.openwall.com/lists/oss-security/2023/02/13/1

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3