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Gentoo GLSA-201709-20: High Severity Postfix Local Threat

gentoo
Calendar Grey September 24, 2017
Dist Gentoo Esm H88
A recent flaw in Postfix on Gentoo systems enables local users to escalate their privileges to root. It's advised to perform an upgrade to bolster system security.
A vulnerability in Postfix may allow local users to gain root privileges.

Summary

By default, Berkeley DB reads a DB_CONFIG configuration file from the current working directory. This is an undocumented behavior.

Topics%20covered

Topics Covered

security advisory high severity gentoo privilege escalation local attack postfix

Resolution

All Postfix users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=mail-mta/postfix-3.1.6"

References

[ 1 ] Postfix Official Announce http://www.postfix.org/announcements/postfix-3.2.2.html

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/201709-20
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Concerns

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.

Severity: High
Title: Postfix: Privilege escalation
Date: September 24, 2017
Bugs: #621882
ID: 201709-20

Topics%20covered

Topics Covered

security advisory high severity gentoo privilege escalation local attack postfix

Synopsis

A vulnerability in Postfix may allow local users to gain root privileges.

Background

Postfix is a mail server and an alternative to the widely-used Sendmail program.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 mail-mta/postfix < 3.1.6 >= 3.1.6

Impact

===== A local attacker, by using a specially crafted DG_CONFIG file, could possibly escalate privileges to the root group.

Workaround

There is no known workaround at this time.