REDHAT-BUG-2255850
First published: Mon Dec 25 2023(Updated: )
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. <a href="https://arxiv.org/abs/2309.02545">https://arxiv.org/abs/2309.02545</a> <a href="https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/auth-passwd.c#L77">https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/auth-passwd.c#L77</a> <a href="https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/monitor.c#L878">https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/monitor.c#L878</a>
| Affected Software | Affected Version | How to fix |
|---|---|---|
| GSI OpenSSH | <=9.6 |
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Reference Links
- https://arxiv.org/abs/2309.02545
- https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/auth-passwd.c#L77
- https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/monitor.c#L878
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2255851
- https://bugzilla.mindrot.org/show_bug.cgi?id=3656
- https://bugzilla.redhat.com/show_bug.cgi?id=2255850
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