A vulnerability found in Shadow may allow local attackers to bypass security restrictions.

Affected Packages

Package sys-apps/shadow on all architectures
Affected versions < 4.6
Unaffected versions >= 4.6

Background

Shadow is a set of tools to deal with user accounts.

Description

A local attacker could possibly bypass security restrictions if an administrator used “group blacklisting” to restrict access to file system paths.

Impact

A local attacker could possibly bypass security restrictions.
Workaround

There is no known workaround at this time.

Resolution

All shadow users should upgrade to the latest version:

1. emerge --sync
2. emerge --ask --oneshot --verbose ">=sys-apps/shadow-4.6"

References

CVE-2018-7169