Courier MTA has fixed a DoS issue related to usernames containing a "=" character.
| Package | Arch | Vulnerable | Unaffected |
|---|---|---|---|
| mail-mta/courier | * | < 0.53.2 | >= 0.53.2 |
Courier MTA is an integrated mail and groupware server based on open protocols.
Courier MTA has fixed a security issue relating to usernames containing the "=" character, causing high CPU utilization.
An attacker could exploit this vulnerability by sending a specially crafted email to a mail gateway running a vulnerable version of Courier MTA.
There is no known workaround at this time.
All Courier MTA users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=mail-mta/courier-0.53.2"
The SqWebMail web application, included in the Courier suite, is vulnerable to cross-site scripting attacks.
| Package | Arch | Vulnerable | Unaffected |
|---|---|---|---|
| mail-mta/courier | * | <= 0.45.6 | >= 0.45.6.20040618 |
Courier is an integrated mail and groupware server based on open protocols. It provides ESMTP, IMAP, POP3, webmail, and mailing list services within a single framework. The webmail functionality included in Courier called SqWebMail allows you to access mailboxes from a web browser.
Luca Legato found that SqWebMail is vulnerable to a cross-site scripting (XSS) attack. An XSS attack allows an attacker to insert malicious code into a web-based application. SqWebMail doesn't filter appropriately data coming from message headers before displaying them.
By sending a carefully crafted message, an attacker can inject and execute script code in the victim's browser window. This allows to modify the behaviour of the SqWebMail application, and/or leak session information such as cookies to the attacker.
There is no known workaround at this time. All users are encouraged to upgrade to the latest available version of Courier.
All Courier users should upgrade to the latest version:
# emerge sync # emerge -pv ">=mail-mta/courier-0.45.6.20040618" # emerge ">=mail-mta/courier-0.45.6.20040618"
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.
| Package | Arch | Vulnerable | Unaffected |
|---|---|---|---|
| mail-mta/courier | * | < 0.45 | >= 0.45 |
| net-mail/courier-imap | * | < 3.0.0 | >= 3.0.0 |
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.
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.
An attacker without privileges may exploit this vulnerability remotely, allowing arbitrary code to be executed in order to gain unauthorized access.
While a workaround is not currently known for this issue, all users are advised to upgrade to the latest version of the affected packages.
All users should upgrade to current versions of the affected packages:
# emerge sync # emerge -pv ">=net-mail/courier-imap-3.0.0" # emerge ">=net-mail/courier-imap-3.0.0" # ** Or; depending on your installation... ** # emerge -pv ">=mail-mta/courier-0.45" # emerge ">=mail-mta/courier-0.45"