TigerVNC version prior to 1.10.1 is vulnerable to stack buffer overflow, which could be triggered from CMsgReader::readSetCursor. This vulnerability occurs due to insufficient sanitization of PixelFormat. Since remote attacker can choose offset from start of the buffer to start writing his values, exploitation of this vulnerability could potentially result into remote code execution. This attack appear to be exploitable via network connectivity.
A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.
| Link | Tags |
|---|---|
| https://github.com/TigerVNC/tigervnc/releases/tag/v1.10.1 | third party advisory patch |
| https://www.openwall.com/lists/oss-security/2019/12/20/2 | mailing list third party advisory exploit |
| https://github.com/CendioOssman/tigervnc/commit/05e28490873a861379c943bf616614b78b558b89 | third party advisory patch |
| http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00039.html | vendor advisory mailing list third party advisory |