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Integer Overflow or Wraparound Affecting libvncserver package, versions <0.9.9+dfsg-1ubuntu1.3

Severity

 Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.66% (80th percentile)

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  • Snyk IDSNYK-UBUNTU1404-LIBVNCSERVER-316800
  • published19 Feb 2018
  • disclosed19 Feb 2018
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Introduced: 19 Feb 2018

CVE-2018-7225  (opens in a new tab)
CWE-190  (opens in a new tab)

How to fix?

Upgrade Ubuntu:14.04 libvncserver to version 0.9.9+dfsg-1ubuntu1.3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libvncserver package and not the libvncserver package as distributed by Ubuntu. See How to fix? for Ubuntu:14.04 relevant fixed versions and status.

An issue was discovered in LibVNCServer through 0.9.11. rfbProcessClientNormalMessage() in rfbserver.c does not sanitize msg.cct.length, leading to access to uninitialized and potentially sensitive data or possibly unspecified other impact (e.g., an integer overflow) via specially crafted VNC packets.

References