Vulnerability DatabaseCVE-2023-25136
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CVE-2023-25136
February 03, 2023
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."
Related Resources (19)
http://www.openwall.com/lists/oss-security/2023/02/13/1
http://www.openwall.com/lists/oss-security/2023/03/09/2
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JGAUIXJ3TEKCRKVWFQ6GDAGQFTIIGQQP/
https://security-tracker.debian.org/tracker/CVE-2023-25136
https://ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/017_sshd.patch.sig
https://github.com/openssh/openssh-portable/commit/486c4dc3b83b4b67d663fb0fa62bc24138ec3946
http://www.openwall.com/lists/oss-security/2023/02/22/1
https://security.gentoo.org/glsa/202307-01
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7LKQDFZWKYHQ65TBSH2X2HJQ4V2THS3/
http://www.openwall.com/lists/oss-security/2023/03/06/1
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R7LKQDFZWKYHQ65TBSH2X2HJQ4V2THS3/
https://www.openwall.com/lists/oss-security/2023/02/02/2
http://www.openwall.com/lists/oss-security/2023/02/22/2
https://news.ycombinator.com/item?id=34711565
https://security.netapp.com/advisory/ntap-20230309-0003/
https://bugzilla.mindrot.org/show_bug.cgi?id=3522
http://www.openwall.com/lists/oss-security/2023/02/23/3
https://jfrog.com/blog/openssh-pre-auth-double-free-cve-2023-25136-writeup-and-proof-of-concept/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JGAUIXJ3TEKCRKVWFQ6GDAGQFTIIGQQP/
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CVSS v4
Base Score:
8.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
HIGH
Weakness Type (CWE)
Double Free
CWE-415
EPSS
Base Score:
89.57