Software Engineering Institute

From the SquirrelMail webpage:

SquirrelMail is a standards-based webmail package written in PHP4. It includes built-in pure PHP support for the IMAP and SMTP protocols, and all pages render in pure HTML 4.0 (with no JavaScript required) for maximum compatibility across browsers. It has very few requirements and is very easy to configure and install. SquirrelMail has all the functionality you would want from an email client, including strong MIME support, address books, and folder manipulation.

SquirrelMail 1.2.6 contains an input-handling flaw that may allow remote attackers to execute arbitrary code with elevated privileges.

Remote attackers could execute arbitrary code with elevated privileges as the SquirrelMail CGI user, typically www-data or similar.

Apply an update
Information for obtaining updates may be found in the "Vendor" section of this note. Users may also visit the SquirrelMail web site for additional information concerning updates.

Note: SquirrelMail 1.2.6 is the only version affected and is from the previous stable release series. The current 1.4.x branch is not affected.