CVE-2024-39894

Published: Jul 2, 2024Modified: Jun 17, 2026Deferred

7.5

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitability: 1.6 / Impact: 5.9

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

OpenSSH 9.5 through 9.7 before 9.8 sometimes allows timing attacks against echo-off password entry (e.g., for su and Sudo) because of an ObscureKeystrokeTiming logic error. Similarly, other timing attacks against keystroke entry could occur.

Related CWEs

CWE-367

Time-of-check Time-of-use (TOCTOU) Race Condition

The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state.

References (20)

http://www.openwall.com/lists/oss-security/2024/07/03/6

Source: cve@mitre.org

http://www.openwall.com/lists/oss-security/2024/07/23/4

Source: cve@mitre.org

http://www.openwall.com/lists/oss-security/2024/07/23/6

Source: cve@mitre.org

http://www.openwall.com/lists/oss-security/2024/07/28/3

Source: cve@mitre.org

https://crzphil.github.io/posts/ssh-obfuscation-bypass/

Source: cve@mitre.org

https://lists.mindrot.org/pipermail/openssh-unix-announce/2024-July/000158.html

Source: cve@mitre.org

https://news.ycombinator.com/item?id=41508530

Source: cve@mitre.org

https://security.netapp.com/advisory/ntap-20240712-0004/

Source: cve@mitre.org

https://www.openssh.com/txt/release-9.8

Source: cve@mitre.org

https://www.openwall.com/lists/oss-security/2024/07/02/1

Source: cve@mitre.org

http://seclists.org/fulldisclosure/2024/Sep/33