An issue was discovered in LinuxTV xawtv before 3.107. The function dev_open() in v4l-conf.c does not perform sufficient checks to prevent an unprivileged caller of the program from opening unintended filesystem paths. This allows a local attacker with access to the v4l-conf setuid-root program to test for the existence of arbitrary files and to trigger an open on arbitrary files with mode O_RDWR. To achieve this, relative path components need to be added to the device path, as demonstrated by a v4l-conf -c /dev/../root/.bash_history command.

Update to 3.107

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.

The remote Ubuntu 16.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-4518-1 advisory.

    Matthias Gerstner discovered that xawtv incorrectly handled opening files. A local attacker could possibly     use this issue to open and write to arbitrary files and escalate privileges. (CVE-2020-13696)

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 was discovered in LinuxTV xawtv before 3.107. The function dev_open() in v4l-conf.c does not perform sufficient checks to prevent an unprivileged caller of the program from opening unintended filesystem paths. This allows a local attacker with access to the v4l-conf setuid-root program to test for the existence of arbitrary files and to trigger an open on arbitrary files with mode O_RDWR. To achieve this, relative path components need to be added to the device path, as demonstrated by a v4l-conf -c /dev/../root/.bash_history command.

For Debian 8 'Jessie', this problem has been fixed in version 3.103-3+deb8u1.

We recommend that you upgrade your xawtv 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.

This update for xawtv fixes the following issues :

  - CVE-2020-13696: Fixed an issue in setuid-root program     that which could have allowed arbitrary file existence     tests and open() with O_RDWR (boo#1171655).

ID	Name	Product	Family	Severity
141143	Fedora 31 : xawtv (2020-93db553bb7)	Nessus	Fedora Local Security Checks	medium
140815	Fedora 32 : xawtv (2020-cd5ad916e4)	Nessus	Fedora Local Security Checks	medium
140649	Ubuntu 16.04 LTS : xawtv vulnerability (USN-4518-1)	Nessus	Ubuntu Local Security Checks	medium
137416	Debian DLA-2246-1 : xawtv security update	Nessus	Debian Local Security Checks	medium
137231	openSUSE Security Update : xawtv (openSUSE-2020-784)	Nessus	SuSE Local Security Checks	medium

Detections

Analytics

CVE-2020-13696

medium

Tenable Plugins

medium

medium

medium

medium

medium