CVE-2020-27348

Publication date 3 December 2020

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.

From the Ubuntu Security Team

It was discovered that snapcraft includes the current directory when configuring LD_LIBRARY_PATH for application commands. If a user were tricked into installing a malicious snap or downloading a malicious library, under certain circumstances an attacker could exploit this to affect strict mode snaps that have access to the library and were launched from the directory containing the library.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
snapcraft	20.10 groovy	Not affected
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Fixed 2.43.1+18.04.1
	16.04 LTS xenial	Fixed 2.43.1+16.04.1
	14.04 LTS trusty	Not in release

Notes

emitorino

Focal, groovy and hirsute are not required due to deb2snap

Severity score breakdown

Parameter	Value
Base score	6.8 · Medium
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	Low
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L

References

Related Ubuntu Security Notices (USN)

USN-4661-1
Snapcraft vulnerability
3 December 2020