TigerVNC version prior to 1.10.1 is vulnerable to heap buffer overflow, which occurs in TightDecoder::FilterGradient. Exploitation of this vulnerability could potentially result into remote code execution. This attack appear to be exploitable via network connectivity.
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
The product writes data past the end, or before the beginning, of the intended buffer.
| Link | Tags |
|---|---|
| https://github.com/CendioOssman/tigervnc/commit/b4ada8d0c6dac98c8b91fc64d112569a8ae5fb95 | third party advisory patch |
| https://github.com/TigerVNC/tigervnc/releases/tag/v1.10.1 | third party advisory release notes |
| https://www.openwall.com/lists/oss-security/2019/12/20/2 | mailing list exploit third party advisory |
| http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00039.html | vendor advisory broken link |