7

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2023-51767

CVE-2023-51767: OpenSSH through 9.6, when common types of DRAM are used, might allow row hammer attacks (for...

OpenSSH through 9.6, 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.

(GitHub Advisory)

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CVE-2023-51767

CVE-2023-51767:

7

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

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Root Cause Analysis

The vulnerability description (CVE-2023-51767) and the referenced source code links directly point to the 'mm_answer_authpassword' function in 'monitor.c' as the location of the vulnerable 'authenticated' integer. The core issue is that a bit flip in this integer, which stores the result of a password check, can change a failed authentication attempt into a successful one from the perspective of the part of OpenSSH that acts on this result. The provided commit information was for a version bump and did not contain a direct fix, and further investigation into OpenSSH's bug tracker confirmed they consider this a platform-level mitigation responsibility. The analysis of the 'monitor.c' source code confirms the role of 'mm_answer_authpassword' and the 'authenticated' variable as described in the CVE. The function 'auth_password' is also relevant as it performs the actual password check, the result of which is stored in the vulnerable 'authenticated' variable within 'mm_answer_authpassword'..

Vulnerable functions

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WAF Rule

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Reasoning

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