libavcodec/webp.c in FFmpeg before 2.8.12, 3.0.x before 3.0.8, 3.1.x before 3.1.8, 3.2.x before 3.2.5, and 3.3.x before 3.3.1 does not ensure that pix_fmt is set, which allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted file, related to the vp8_decode_mb_row_no_filter and pred8x8_128_dc_8_c functions.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
| Link | Tags |
|---|---|
| https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1435 | issue tracking third party advisory |
| http://www.securityfocus.com/bid/99317 | vdb entry third party advisory |
| https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1434 | issue tracking third party advisory |
| https://lists.debian.org/debian-lts-announce/2019/01/msg00006.html | third party advisory mailing list |
| https://github.com/FFmpeg/FFmpeg/commit/6b5d3fb26fb4be48e4966e4b1d97c2165538d4ef | issue tracking third party advisory patch |