Information disclosure in snapd

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU18376

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-11502

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive  information.

The vulnerability exists due to an error in snap-confine when setting owneship permissions of a snap application to the uid and gid of the first calling user. A local user can gain unauthorized access to files in private /tmp directory.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Snapd: 2.0 - 2.37.4

External links

http://www.openwall.com/lists/oss-security/2019/04/25/7
http://github.com/snapcore/snapd/commit/bdbfeebef03245176ae0dc323392bb0522a339b1
http://www.openwall.com/lists/oss-security/2019/04/18/4

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.