Firejail uses 0777 permissions when mounting /tmp, which allows local users to gain privileges.

Description

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

References

• [oss-security] 20170105 Re: Firejail local root exploit mailing-list
• [oss-security] 20170106 Re: Firejail local root exploit mailing-list