Heap-based buffer overflow in ultra.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message with the Ultra type tile, such that the LZO payload decompressed length exceeds what is specified by the tile dimensions.
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 |
|---|---|
| http://www.securityfocus.com/bid/95170 | vdb entry |
| https://github.com/LibVNC/libvncserver/pull/137 | |
| http://www.debian.org/security/2017/dsa-3753 | vendor advisory |
| https://security.gentoo.org/glsa/201702-24 | vendor advisory |
| https://github.com/LibVNC/libvncserver/releases/tag/LibVNCServer-0.9.11 | |
| https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html | mailing list |
| https://usn.ubuntu.com/4587-1/ | vendor advisory |