CVE-2019-15691 Use after free in TigerVNC

What is CVE-2019-15691?

CVE-2019-15691 is a high-severity use after free vulnerability in Opensuse Leap, published on 26 Dec 2019. An attacker needs administrator access to exploit it, with no action from the victim.

Official 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.

Weakness: CWE-672, CWE-825

Which versions are affected by CVE-2019-15691?

It affects 2 products.

Products include Opensuse Leap, Tigervnc Tigervnc.

How do I fix CVE-2019-15691?

Upgrade to a fixed version.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2019-15691 being exploited?

There is no known exploitation of CVE-2019-15691 in the wild and no public exploit code.

Other vulnerabilities in Opensuse Leap

• CVE-2015-4902 Oracle Java SE Integrity Check Exploited Medium 5.3
• CVE-2017-14804 package builds could use directory traversal to write outside of target area Critical 9.9
• CVE-2019-20787 Teeworlds before 0.7.4 has an integer overflow when computing a tilemap size. Critical 9.8
• CVE-2019-8341 Code injection in n/a Critical 9.8
• CVE-2019-6438 Other in n/a Critical 9.8

All Opensuse Leap vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2019-15691, GHSA-vmc8-ggh9-8p8j, UBUNTU-CVE-2019-15691.