In libpixman in Pixman before 0.42.2, there is an out-of-bounds write (aka heap-based buffer overflow) in rasterize_edges_8 due to an integer overflow in pixman_sample_floor_y.
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://gitlab.freedesktop.org/pixman/pixman/-/issues/63 | patch exploit third party advisory issue tracking |
| http://www.openwall.com/lists/oss-security/2022/11/05/1 | mailing list |
| https://lists.debian.org/debian-lts-announce/2022/11/msg00008.html | third party advisory mailing list |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BY4OPSIB33ETNUXZY2UPZ4NGQ3OKDY4D/ | vendor advisory |
| https://www.debian.org/security/2022/dsa-5276 | third party advisory vendor advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AJ5VY2VYXE4WTRGQ6LMGLF6FV3SY37YE/ | vendor advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUJ2BULJTZ2BMSKQHB6US674P55UCWWS/ | vendor advisory |
| http://packetstormsecurity.com/files/170121/pixman-pixman_sample_floor_y-Integer-Overflow.html | third party advisory exploit |