Bug 1789908 (CVE-2019-15691) - CVE-2019-15691 tigervnc: Stack use-after-return due to incorrect usage of stack memory in ZRLEDecoder
Summary: CVE-2019-15691 tigervnc: Stack use-after-return due to incorrect usage of sta...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-15691
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1789909 1791759 1791760 1819884 1819885
Blocks: 1789910 1790319
TreeView+ depends on / blocked
 
Reported: 2020-01-10 17:13 UTC by Guilherme de Almeida Suckevicz
Modified: 2020-09-29 19:27 UTC (History)
4 users (show)

Fixed In Version:
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Last Closed: 2020-04-16 22:31:52 UTC
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:1497 0 None None None 2020-04-16 21:06:29 UTC
Red Hat Product Errata RHSA-2020:3875 0 None None None 2020-09-29 19:27:45 UTC

Description Guilherme de Almeida Suckevicz 2020-01-10 17:13:29 UTC 
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.

Reference and upstream commit:
https://github.com/CendioOssman/tigervnc/commit/d61a767d6842b530ffb532ddd5a3d233119aad40
Comment 1 Guilherme de Almeida Suckevicz 2020-01-10 17:13:44 UTC 
Created tigervnc tracking bugs for this issue:

Affects: fedora-all [bug 1789909]
Comment 2 Huzaifa S. Sidhpurwala 2020-01-16 12:37:44 UTC 
https://github.com/TigerVNC/tigervnc/pull/921

As per upstream " All issues require a successfully authenticated connection though."
Comment 4 errata-xmlrpc 2020-04-16 21:06:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:1497 https://access.redhat.com/errata/RHSA-2020:1497
Comment 5 Product Security DevOps Team 2020-04-16 22:31:52 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-15691
Comment 6 errata-xmlrpc 2020-09-29 19:27:43 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:3875 https://access.redhat.com/errata/RHSA-2020:3875
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