Vulnerability · Published Dec 24, 2023 · Assigned by mitre
CVE-2023-51767
High 7.0
In plain English
A high-severity security flaw in the openssh package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
OpenSSH through 10.0, when common types of DRAM are used, might allow row hammer attacks (for authentication bypass) because the integer value of authenticated in mm_answer_authpassword does not resist flips of a single bit. NOTE: this is applicable to a certain threat model of attacker-victim co-location in which the attacker has user privileges. NOTE: this is disputed by the Supplier, who states "we do not consider it to be the application's responsibility to defend against platform architectural weaknesses."
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | openssh | 9.7_p1-r0 | ALPINE-CVE-2023-51767 |
| Alpine:v3.21 | openssh | 9.7_p1-r0 | ALPINE-CVE-2023-51767 |
| Alpine:v3.22 | openssh | 9.7_p1-r0 | ALPINE-CVE-2023-51767 |
| Alpine:v3.23 | openssh | 9.7_p1-r0 | ALPINE-CVE-2023-51767 |
| Alpine:v3.24 | openssh | 9.7_p1-r0 | ALPINE-CVE-2023-51767 |
| Ubuntu:22.04:LTS | openssh | no fix listed | UBUNTU-CVE-2023-51767 |
| Ubuntu:22.04:LTS | openssh-ssh1 | no fix listed | UBUNTU-CVE-2023-51767 |
Affected products (as reported)
References
- https://arxiv.org/abs/2309.02545
- https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/monitor.c#L878
- https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/auth-passwd.c#L77
- https://bugzilla.redhat.com/show_bug.cgi?id=2255850
- https://access.redhat.com/security/cve/CVE-2023-51767
- https://ubuntu.com/security/CVE-2023-51767
- https://security.netapp.com/advisory/ntap-20240125-0006/
- https://www.openwall.com/lists/oss-security/2025/09/22/1
- http://www.openwall.com/lists/oss-security/2025/10/01/1
- http://www.openwall.com/lists/oss-security/2025/09/22/1
- http://www.openwall.com/lists/oss-security/2025/09/24/4
- http://www.openwall.com/lists/oss-security/2025/09/22/2
- http://www.openwall.com/lists/oss-security/2025/09/23/4
- http://www.openwall.com/lists/oss-security/2025/10/01/2
- http://www.openwall.com/lists/oss-security/2025/09/26/2
- http://www.openwall.com/lists/oss-security/2025/09/26/4
- http://www.openwall.com/lists/oss-security/2025/09/27/1
- http://www.openwall.com/lists/oss-security/2025/09/27/2
- http://www.openwall.com/lists/oss-security/2025/09/27/3
- http://www.openwall.com/lists/oss-security/2025/09/27/5
- http://www.openwall.com/lists/oss-security/2025/09/27/6
- http://www.openwall.com/lists/oss-security/2025/09/27/7
- http://www.openwall.com/lists/oss-security/2025/09/29/4
- http://www.openwall.com/lists/oss-security/2025/09/29/5
- http://www.openwall.com/lists/oss-security/2025/09/23/1
- http://www.openwall.com/lists/oss-security/2025/09/29/6
- http://www.openwall.com/lists/oss-security/2025/09/23/3
- http://www.openwall.com/lists/oss-security/2025/09/23/5
- http://www.openwall.com/lists/oss-security/2025/09/24/7
- http://www.openwall.com/lists/oss-security/2025/09/25/2
- http://www.openwall.com/lists/oss-security/2025/09/25/6
- http://www.openwall.com/lists/oss-security/2025/09/27/4
- http://www.openwall.com/lists/oss-security/2025/09/28/7
- http://www.openwall.com/lists/oss-security/2025/09/29/1
- https://cert-portal.siemens.com/productcert/html/ssa-794697.html