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CVE

CVE-2023-25136

OpenSSH server (sshd) 9.1 introduced a double-free vulnerability during options.kex_algorithms handling. This is fixed i

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.".

MEDIUM · CVSS 6.5 EPSS 0.88329
Act now
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
Sigma rules2 YARA rules0
⬡

Weakness Classification

CWE-415Double Free
▤

Affected Products & Versions

6
openbsd opensshall versions
fedoraproject fedoraall versions
netapp ontap select deploy administration utilityall versions
netapp a250 firmwareall versions
netapp 500f firmwareall versions
netapp c250 firmwareall versions
⚠

Public Exploits & PoCs

2
pocbugzilla.mindrot.org · show_bug.cgi?id=3522bugzilla.mindrot.org
pocjfrog.com · openssh-pre-auth-double-free-cve-2023-25136-writeup-and-p...jfrog.com
◈

Sigma Hunt Rules

2
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumSuspicious OpenSSH Daemon Error
productmediumOpenSSH Server Listening On Socket
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD03 Feb 2023 · 06:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
⚑

Vendor Advisories

5
msrcCVE-2023-25136
siemens-csafSSA-398330
rhsaRHSA-2023:2645Moderate
oracle-cpuoracle-cpu-Oracle-Healthcare-Translational-Research-9427--CVE-2023-25136
cisa-csafcisa-csaf-csaf_files-OT-white-2023-icsa-23-348-10
🔗

References & Sources

14
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.openwall.com/lists/oss-security/2023/02/13/1Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2023/02/22/1Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2023/02/22/2Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2023/02/23/3Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2023/03/06/1Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2023/03/09/2Mailing ListThird Party Advisory
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