Vulnerability identifier: #VU39669

Vulnerability 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-2017-5180

CWE-ID: CWE-862

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
firejail
Other software / Other software solutions

Vendor: firejail.wordpress.com

Description

The vulnerability allows a local authenticated user to execute arbitrary code.

Firejail before 0.9.44.4 and 0.9.38.x LTS before 0.9.38.8 LTS does not consider the .Xauthority case 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 update from vendor's website.

Vulnerable software versions

firejail: 0.9.40

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External links
http://openwall.com/lists/oss-security/2017/01/04/2
http://www.securityfocus.com/bid/95298
http://firejail.wordpress.com/download-2/release-notes/
http://security.gentoo.org/glsa/201701-62

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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.