It was found that xorg-x11-server prior to 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.
| Vulnerable Product | Search on Vulmon | Subscribe to Product |
|---|---|---|
x.org xorg-server |
||
debian debian linux 7.0 |
Vulmon