[ GLSA 200403-06 ] Multiple remote buffer overflow vulnerabilities in Courier

[GLSA]

Gentoo Linux Security Advisory

Title: Multiple remote buffer overflow vulnerabilities in Courier (GLSA 200403-06)
Severity: normal
Exploitable: remote
Date: March 26, 2004
Bug(s): #45584
ID: 200403-06

Synopsis


Remote buffer overflow vulnerabilities have been found in Courier-IMAP and
Courier MTA. These exploits may allow the execution of abritrary code,
allowing unauthorized access to a vulnerable system.


Background


Courier MTA is a multiprotocol mail server suite that provides webmail,
mailing lists, IMAP, and POP3 services. Courier-IMAP is a standalone server
that gives IMAP access to local mailboxes.


Affected Packages

Package: net-mail/courier-imap
Vulnerable: < 3.0.0
Unaffected: >= 3.0.0
Architectures: All supported architectures

Package: mail-mta/courier
Vulnerable: < 0.45
Unaffected: >= 0.45
Architectures: All supported architectures


Description


The vulnerabilities have been found in the 'SHIFT_JIS' converter in
'shiftjis.c' and 'ISO2022JP' converter in 'so2022jp.c'. An attacker may
supply Unicode characters that exceed BMP (Basic Multilingual Plane) range,
causing an overflow.


Impact


An attacker without privileges may exploit this vulnerability remotely, allowing arbitrary code to be executed in order to gain unauthorized access.


Workaround


While a workaround is not currently known for this issue, all users are
advised to upgrade to the latest version of the affected packages.


Resolution


All users should upgrade to current versions of the affected packages: