Improper Privilege Management in firejail - CVE-2017-5940

Vulnerability details

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.

Affected software

How to mitigate CVE-2017-5940

External References

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

Related Security Bulletins

• Improper Privilege Management in firejail.wordpress.com firejail
• Improper Privilege Management in firejail.wordpress.com firejail
• Gentoo update for Firejail