Improper Privilege Management in firejail.wordpress.com firejail

1) Improper Privilege Management

EUVDB-ID: #VU45677

Risk: Low

CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-5940

CWE-ID: CWE-269 - Improper Privilege Management

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to firejail does not comprehensively address dotfile cases during its attempt to prevent accessing user files with an euid of zero, which allows local users to conduct sandbox-escape attacks via vectors involving a symlink and the --private option.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

firejail: 0.9.38 - 0.9.44.4

External links

http://www.openwall.com/lists/oss-security/2017/01/31/16
http://www.securityfocus.com/bid/96221
http://firejail.wordpress.com/download-2/release-notes/
http://github.com/netblue30/firejail/commit/38d418505e9ee2d326557e5639e8da49c298858f
http://github.com/netblue30/firejail/commit/903fd8a0789ca3cc3c21d84cd0282481515592ef
http://github.com/netblue30/firejail/commit/b8a4ff9775318ca5e679183884a6a63f3da8f863
http://security.gentoo.org/glsa/201702-03

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.