Synopsis
Moderate: tigervnc security update
Type/Severity
Security Advisory: Moderate
Topic
An update for tigervnc is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Description
Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. TigerVNC is a suite of VNC servers and clients.
Security Fix(es):
- tigervnc: Stack use-after-return due to incorrect usage of stack memory in ZRLEDecoder (CVE-2019-15691)
- tigervnc: Heap buffer overflow triggered from CopyRectDecoder due to incorrect value checks (CVE-2019-15692)
- tigervnc: Heap buffer overflow in TightDecoder::FilterGradient (CVE-2019-15693)
- tigervnc: Heap buffer overflow in DecodeManager::decodeRect (CVE-2019-15694)
- tigervnc: Stack buffer overflow in CMsgReader::readSetCursor (CVE-2019-15695)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Solution
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
Affected Products
-
Red Hat Enterprise Linux for x86_64 8 x86_64
-
Red Hat Enterprise Linux for x86_64 - Extended Update Support 8.1 x86_64
Fixes
- BZ - 1789527 - CVE-2019-15692 tigervnc: Heap buffer overflow triggered from CopyRectDecoder due to incorrect value checks
- BZ - 1789908 - CVE-2019-15691 tigervnc: Stack use-after-return due to incorrect usage of stack memory in ZRLEDecoder
- BZ - 1790313 - CVE-2019-15693 tigervnc: Heap buffer overflow in TightDecoder::FilterGradient
- BZ - 1790315 - CVE-2019-15694 tigervnc: Heap buffer overflow in DecodeManager::decodeRect
- BZ - 1790318 - CVE-2019-15695 tigervnc: Stack buffer overflow in CMsgReader::readSetCursor
CVEs
References
Vulmon