CVE-2020-27348: snapcraft may build snaps with incorrect LD_LIBRARY_PATH
First published: Fri Dec 04 2020(Updated: )
In some conditions, a snap package built by snapcraft includes the current directory in `LD_LIBRARY_PATH`, allowing a malicious snap to gain code execution within the context of another snap if both plug the home interface or similar. This issue affects snapcraft versions prior to 4.4.4, prior to 2.43.1+16.04.1, and prior to 2.43.1+18.04.1.
Credit: security@ubuntu.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/snapcraft | <4.4.4 | 4.4.4 |
| Snapcraft Snapd | <4.4.4 | |
| Ubuntu | =16.04 | |
| Ubuntu | =18.04 |
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Reference Links
- https://bugs.launchpad.net/bugs/1901572
- https://github.com/snapcore/snapcraft/pull/3345
- https://usn.ubuntu.com/usn/usn-4661-1
- https://launchpad.net/bugs/cve/CVE-2020-27348
- https://security-tracker.debian.org/tracker/CVE-2020-27348
- https://nvd.nist.gov/vuln/detail/CVE-2020-27348
- https://github.com/snapcore/snapcraft/commit/a0ceca9d531a34c979251030ed67b5fa2abfdd9a
- https://github.com/advisories/GHSA-qxm5-vx5j-pp6w (Advisory)
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27348
- https://ubuntu.com/security/CVE-2020-27348
- https://github.com/pypa/advisory-database/tree/main/vulns/snapcraft/PYSEC-2020-109.yaml
Frequently Asked Questions
What is the severity of CVE-2020-27348?
CVE-2020-27348 has been classified as a medium severity vulnerability.
How do I fix CVE-2020-27348?
To fix CVE-2020-27348, upgrade your snapcraft version to at least 4.4.4.
What software is affected by CVE-2020-27348?
CVE-2020-27348 affects snapcraft versions prior to 4.4.4 and specific versions of Ubuntu 16.04 and 18.04.
What is the impact of CVE-2020-27348?
CVE-2020-27348 allows a malicious snap to gain code execution within the context of another snap.
How can CVE-2020-27348 be exploited?
CVE-2020-27348 can be exploited if both snaps plug the home interface or similar, leveraging the LD_LIBRARY_PATH.
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