An integer overflow vulnerability leading to a double-free was found in libX11. This flaw allows a local privileged attacker to cause an application compiled with libX11 to crash, or in some cases, result in arbitrary code execution. The highest threat from this flaw is to confidentiality, integrity as well as system availability.
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
| Link | Tags |
|---|---|
| https://github.com/Ruia-ruia/Exploits/blob/master/DFX11details.txt | third party advisory |
| https://github.com/Ruia-ruia/Exploits/blob/master/x11doublefree.sh | third party advisory exploit |
| https://lists.x.org/archives/xorg-announce/2020-August/003056.html | vendor advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14363 | third party advisory issue tracking |
| https://usn.ubuntu.com/4487-2/ | third party advisory vendor advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7AVXCQOSCAPKYYHFIJAZ6E2C7LJBTLXF/ | vendor advisory |