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CVE-2018-6553
AppArmor cupsd Sandbox Bypass Due to Use of Hard Links
High8.8EPSS 0.39%
- Published
- Updated
- Reserved
- Assigned by
- canonical
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | High8.8 | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.39% · top 67% of all CVEs (3 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Weakness
- Escape from sandbox confinement
Affected products
cups
- affected unspecified – < 2.2.7-1ubuntu2.1
cups
- affected unspecified – < 2.2.4-7ubuntu3.1
cups
- affected unspecified – < 2.1.3-4ubuntu0.5
cups
- affected unspecified – < 1.7.2-0ubuntu1.10
References (4)
- USN-3713-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- DSA-4243 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- [debian-lts-announce] 20180714 [SECURITY] [DLA 1426-1] cups security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- GLSA-201908-08 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2018-6553)Record last updated .