The getImageData function in the ImageBufferCairo class in WebCore/platform/graphics/cairo/ImageBufferCairo.cpp in WebKit, as used in WebKitGTK+ prior to version 2.20.3 and WPE WebKit prior to version 2.20.1, is vulnerable to a heap-based buffer overflow triggered by an integer overflow, which could be abused by crafted HTML content.

The remote host is affected by the vulnerability described in GLSA-201808-04 (WebkitGTK+: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in WebKitGTK+. Please       review the referenced CVE identifiers for details.
  Impact :

    A remote attacker could execute arbitrary commands or cause a denial of       service condition  via a maliciously crafted web content.
  Workaround :

    There is no known workaround at this time.

The remote Ubuntu 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3687-1 advisory.

    A large number of security issues were discovered in the WebKitGTK+ Web and JavaScript engines. If a user     were tricked into viewing a malicious website, a remote attacker could exploit a variety of issues related     to web browser security, including cross-site scripting attacks, denial of service attacks, and arbitrary     code execution.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
112078	GLSA-201808-04 : WebkitGTK+: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
110611	Ubuntu 16.04 LTS / 18.04 LTS : WebKitGTK+ vulnerabilities (USN-3687-1)	Nessus	Ubuntu Local Security Checks	high

Detections

Analytics

CVE-2018-12293

high

Tenable Plugins

high

high