It was found that xorg-x11-server before 1.19.0 including...
High severity
Unreviewed
Published
May 13, 2022
to the GitHub Advisory Database
•
Updated Feb 1, 2023
Description
Published by the National Vulnerability Database
Jul 27, 2018
Published to the GitHub Advisory Database
May 13, 2022
Last updated
Feb 1, 2023
It was found that xorg-x11-server before 1.19.0 including uses memcmp() to check the received MIT cookie against a series of valid cookies. If the cookie is correct, it is allowed to attach to the Xorg session. Since most memcmp() implementations return after an invalid byte is seen, this causes a time difference between a valid and invalid byte, which could allow an efficient brute force attack.
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