CVE-2023-25136
6.5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
6.8 Medium
AI Score
Confidence
High
0.009 Low
EPSS
Percentile
82.6%
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 configurations
| CPE | Name | Operator | Version |
|---|---|---|---|
| openbsd:openssh | openbsd openssh | eq | 9.1 |
References
www.openwall.com/lists/oss-security/2023/02/13/1
www.openwall.com/lists/oss-security/2023/02/22/1
www.openwall.com/lists/oss-security/2023/02/22/2
www.openwall.com/lists/oss-security/2023/02/23/3
www.openwall.com/lists/oss-security/2023/03/06/1
www.openwall.com/lists/oss-security/2023/03/09/2
bugzilla.mindrot.org/show_bug.cgi?id=3522
ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/017_sshd.patch.sig
github.com/openssh/openssh-portable/commit/486c4dc3b83b4b67d663fb0fa62bc24138ec3946
jfrog.com/blog/openssh-pre-auth-double-free-cve-2023-25136-writeup-and-proof-of-concept/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JGAUIXJ3TEKCRKVWFQ6GDAGQFTIIGQQP/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7LKQDFZWKYHQ65TBSH2X2HJQ4V2THS3/
news.ycombinator.com/item?id=34711565
security.gentoo.org/glsa/202307-01
security.netapp.com/advisory/ntap-20230309-0003/
www.openwall.com/lists/oss-security/2023/02/02/2
Social References
More
Related
6.5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
6.8 Medium
AI Score
Confidence
High
0.009 Low
EPSS
Percentile
82.6%