The igraph_i_strdiff function in igraph_trie.c in igraph through 0.7.1 has an NULL pointer dereference that allows attackers to cause a denial of service (application crash) via a crafted object.

The remote Ubuntu 16.04 LTS / 18.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-4644-1 advisory.

    It was discovered that igraph mishandled certain malformed XML. An attacker could use this vulnerability     to cause a denial of service (crash).

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

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

An issue has been found in igraph, a library for creating and manipulating graphs. A NULL pointer dereference vulneribility was detected in igraph_i_strdiff().

For Debian 8 'Jessie', this problem has been fixed in version 0.7.1-2+deb8u1.

We recommend that you upgrade your igraph packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Patch for CVE-2018-20349

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
143249	Ubuntu 16.04 LTS / 18.04 LTS : igraph vulnerability (USN-4644-1)	Nessus	Ubuntu Local Security Checks	medium
132592	Debian DLA-2055-1 : igraph security update	Nessus	Debian Local Security Checks	medium
127872	Fedora 29 : igraph (2019-5d52865475)	Nessus	Fedora Local Security Checks	medium
127869	Fedora 30 : igraph (2019-060e7b383c)	Nessus	Fedora Local Security Checks	medium

Detections

Analytics

CVE-2018-20349

medium

Tenable Plugins

medium

medium

medium

medium