Ubuntu 16.04 LTS : ubuntu-core-launcher vulnerability (USN-2956-1)
Critical Nessus Plugin ID 90827
SynopsisThe remote Ubuntu host is missing a security-related patch.
DescriptionZygmunt Krynicki discovered that ubuntu-core-launcher did not properly sanitize its input and contained a logic error when determining the mount point of bind mounts when using snaps on Ubuntu classic systems (eg, traditional desktop and server). If a user were tricked into installing a malicious snap with a crafted snap name, an attacker could perform a delayed attack to steal data or execute code within the security context of another snap. This issue did not affect Ubuntu Core systems.
Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
SolutionUpdate the affected ubuntu-core-launcher package.