The latest package of SquirrelMail webmail application was compromised. Here is a statement from the SquirrelMail developers:
It has been brought to our attention that the MD5 sums for the 1.4.12 package were not matching the actual package. We’ve been investigating this issue, and uncovered that the package was modified post release. This was believed to have been caused by a compromised account from one of our release maintainers.
Further investigations show that the modifications to the code should have little to no impact at this time. Modifications seemed to be based around a PHP global variable which we cannot track down. The changes made will most likely generate an error, rather than a compromise of a system in the event the code does get executed.
Original packages, stored on secure media, have been restored to the Sourceforge download servers, and additional signatures for the packages are now available on the SquirrelMail download page.
While we believe the changes made should have little impact, we strongly recommend everybody that has downloaded the 1.4.12 package after the 8th December, to redownload the package.
The code modifications did not made it into our source control, just the final package. We are currently investigating older packages to see if they were also compromised.
Once again, the original package MD5s are:
We apologies for the inconvenience this may have caused.