CVE-2018-6553

AppArmor cupsd Sandbox Bypass Due to Use of Hard Links

N/A

Published: August 10, 2018 at 03:00 PM UTC

Updated: June 17, 2026 at 02:02 AM UTC

3 products affected across 3 vendorsDebian LinuxUbuntu LinuxCups

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Severity

N/A

Exploit prediction

EPSS 0.4%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ubuntu Linux · Canonicalrubygems

95%

14.04 16.04 17.10 18.04

Cups · Cups

95%

v < 1.7.2-0ubuntu1.10v < 2.1.3-4ubuntu0.5v < 2.2.4-7ubuntu3.1v < 2.2.7-1ubuntu2.1

Affected range stops below 1.7.2-0ubuntu1.10, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.1.3-4ubuntu0.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.2.4-7ubuntu3.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.2.7-1ubuntu2.1, so it looks safe — our inference, not a vendor statement

Debian Linux · Debiandrupal

95%

8.0 9.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

Mailing Listx_refsource_MLISTIssue TrackingThird Party Advisory

Source: [email protected]

https://lists.debian.org/debian-lts-announce/2018/07/msg00014.html

Vendor Advisoryx_refsource_GENTOO

Source: [email protected]

https://security.gentoo.org/glsa/201908-08

Vendor Advisoryx_refsource_UBUNTUThird Party Advisory

Source: [email protected]

https://usn.ubuntu.com/usn/usn-3713-1

Vendor Advisoryx_refsource_DEBIANThird Party Advisory

Source: [email protected]

https://www.debian.org/security/2018/dsa-4243

CVSS

4.6MEDIUM[email protected]

Confidentiality: PARTIAL
Integrity: PARTIAL
Availability: PARTIAL

Vector?

Quick Info

StatusMODIFIED

CWE

NVD-CWE-noinfo

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