Vulnerability · Published Dec 4, 2020 · Assigned by canonical

CVE-2020-27348snapcraft may build snaps with incorrect LD_LIBRARY_PATH

Medium 6.8

In plain English

A medium-severity uncontrolled search path in snapcraft from Canonical. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.8Medium

Exploit odds (30 days)0.7%top 46.5% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	snapcraft	4.4.4	GHSA-qxm5-vx5j-pp6w
PyPI	snapcraft	2.43.1	PYSEC-2020-109

Affected products (as reported)

Vendor	Product	Versions
Canonical	snapcraft	4.4 – before 4.4.42.43.1 – before 2.43.1+16.04.1

Weakness: CWE-427 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L

References

https://github.com/snapcore/snapcraft/pull/3345 x_refsource_MISC
https://usn.ubuntu.com/usn/usn-4661-1 x_refsource_MISC
https://bugs.launchpad.net/bugs/1901572 x_refsource_MISC