[ GLSA 201709-19 ] Exim

[GLSA]

Gentoo Linux Security Advisory

Title: Exim: Local privilege escalation (GLSA 201709-19)
Severity: normal
Exploitable: local
Date: 2017-09-24
Bug(s): #622212
ID: 201709-19

Synopsis

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



Background

Exim is a message transfer agent (MTA) developed at the University of
Cambridge for use on Unix systems connected to the Internet.


Affected Packages

Package: mail-mta/exim
Vulnerable: < 4.89-r1
Unaffected: >= 4.89-r1
Architectures: All supported architectures


Description

Exim supports the use of multiple “-p” command line arguments
causing a memory leak. This could lead to a stack-clash in user-space and
as result the attacker can, “clash” or “smash” the stack or
another memory region, or “jump” over the stack guard-page.


Impact

A local attacker could obtain root privileges.

Workaround

There is no known workaround at this time.

Resolution

All Exim users should upgrade to the latest version: