CVE-2019-15691 Information

Description

TigerVNC version prior to 1.10.1 is vulnerable to stack use-after-return which occurs due to incorrect usage of stack memory in ZRLEDecoder. If decoding routine would throw an exception ZRLEDecoder may try to access stack variable which has been already freed during the process of stack unwinding. Exploitation of this vulnerability could potentially result into remote code execution. This attack appear to be exploitable via network connectivity.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Reference

http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00039.html https://github.com/CendioOssman/tigervnc/commit/d61a767d6842b530ffb532ddd5a3d233119aad40 https://github.com/TigerVNC/tigervnc/releases/tag/v1.10.1 https://www.openwall.com/lists/oss-security/2019/12/20/2

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction Required

HIGH

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.2