CVE-2018-6553

AppArmor cupsd Sandbox Bypass Due to Use of Hard Links

Description

The CUPS AppArmor profile incorrectly confined the dnssd backend due to use of hard links. A local attacker could possibly use this issue to escape confinement. This flaw affects versions prior to 2.2.7-1ubuntu2.1 in Ubuntu 18.04 LTS, prior to 2.2.4-7ubuntu3.1 in Ubuntu 17.10, prior to 2.1.3-4ubuntu0.5 in Ubuntu 16.04 LTS, and prior to 1.7.2-0ubuntu1.10 in Ubuntu 14.04 LTS.

8.8

CVSS

Severity: High

CVSS 3.0 •

CVSS 2.0 •

EPSS 0.07%

Vendor Advisory ubuntu.com Vendor Advisory debian.org Vendor Advisory gentoo.org

Affected: n/a cups

References

Link	Tags
https://usn.ubuntu.com/usn/usn-3713-1	third party advisory vendor advisory
https://www.debian.org/security/2018/dsa-4243	third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2018/07/msg00014.html	issue tracking mailing list third party advisory
https://security.gentoo.org/glsa/201908-08	vendor advisory

Frequently Asked Questions

What is the severity of CVE-2018-6553?: CVE-2018-6553 has been scored as a high severity vulnerability.
How to fix CVE-2018-6553?: To fix CVE-2018-6553, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-6553 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2018-6553 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2018-6553?: CVE-2018-6553 affects n/a cups, n/a cups, n/a cups, n/a cups.

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