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Vulnerability Details : CVE-2019-15691

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.
Publish Date : 2019-12-26 Last Update Date : 2020-01-21
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- CVSS Scores & Vulnerability Types

CVSS Score
6.5
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication ???
Gained Access None
Vulnerability Type(s) Execute Code
CWE ID 672

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2020:1497: tigervnc security update (Moderate) oval:com.redhat.rhsa:def:20201497 unix
RHSA-2020:3875: tigervnc security and bug fix update (Moderate) oval:com.redhat.rhsa:def:20203875 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2019-15691

# Product Type Vendor Product Version Update Edition Language
1 Application Tigervnc Tigervnc * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Tigervnc Tigervnc 1

- References For CVE-2019-15691

http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00039.html
SUSE openSUSE-SU-2020:0087
https://www.openwall.com/lists/oss-security/2019/12/20/2
MLIST [oss-security] 20191220 VNC vulnerabilities. TigerVNC security update
https://github.com/CendioOssman/tigervnc/commit/d61a767d6842b530ffb532ddd5a3d233119aad40
https://github.com/TigerVNC/tigervnc/releases/tag/v1.10.1

- Metasploit Modules Related To CVE-2019-15691

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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