CVE-2020-13696
MEDIUMCVSS 4.4/10EPSS 0.36%
Last modified
CVE-2020-13696 is a medium-severity vulnerability rated 4.4/10 on the CVSS scale. 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. EPSS estimates a 0.36% chance of exploitation in the next 30 days.
Description
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linuxtv | Xawtv | < 3.107 | — |
| Debian | Debian Linux | 8.0 | — |
| Opensuse | Backports Sle | 15.0 | Sp1 |
| Opensuse | Leap | 15.1 | — |
| Fedoraproject | Fedora | 31 | — |
| Fedoraproject | Fedora | 32 | — |
| Canonical | Ubuntu Linux | 16.04 | — |
References
- https://lists.opensuse.org/opensuse-security-announce/2020-06/msg00009.htmlMailing List, Third Party Advisory
- https://lists.opensuse.org/opensuse-security-announce/2020-06/msg00013.htmlMailing List, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2020/06/04/6Issue Tracking, Mailing List, Third Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-13696Broken Link, Issue Tracking, Third Party Advisory
- https://git.linuxtv.org/xawtv3.git/commit/?id=31f31f9cbaee7be806cba38e0ff5431bd44b20a3Patch, Vendor Advisory
- https://git.linuxtv.org/xawtv3.git/commit/?id=36dc44e68e5886339b4a0fbe3f404fb1a4fd2292Patch, Vendor Advisory
- https://git.linuxtv.org/xawtv3.git/commit/?id=8e3feea862db68d3ca0886f46cd99fab45d2db7cPatch, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2020/06/msg00018.htmlMailing List, Third Party Advisory
- https://usn.ubuntu.com/4518-1/Third Party Advisory
- https://lists.opensuse.org/opensuse-security-announce/2020-06/msg00009.htmlMailing List, Third Party Advisory
- https://lists.opensuse.org/opensuse-security-announce/2020-06/msg00013.htmlMailing List, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2020/06/04/6Issue Tracking, Mailing List, Third Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-13696Broken Link, Issue Tracking, Third Party Advisory
- https://git.linuxtv.org/xawtv3.git/commit/?id=31f31f9cbaee7be806cba38e0ff5431bd44b20a3Patch, Vendor Advisory
- https://git.linuxtv.org/xawtv3.git/commit/?id=36dc44e68e5886339b4a0fbe3f404fb1a4fd2292Patch, Vendor Advisory
- https://git.linuxtv.org/xawtv3.git/commit/?id=8e3feea862db68d3ca0886f46cd99fab45d2db7cPatch, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2020/06/msg00018.htmlMailing List, Third Party Advisory
- https://usn.ubuntu.com/4518-1/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-13696?
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.
How severe is CVE-2020-13696?
CVE-2020-13696 has a CVSS score of 4.4/10 (MEDIUM severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.
How do I fix CVE-2020-13696?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
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