Technical Description

Two vulnerabilities were identified in ACal Project, which could be exploited by remote attackers to execute arbitrary commands and bypass the authentication procedure.

The first issue is due to an error in the "login.php" script that relies on the "ACalAuthenticate" cookie parameter to determine if a user has been successfully authenticated, which could be exploited by remote attackers to bypass the authentication process and gain unauthorized access to the application by setting the "ACalAuthenticate" parameter to "inside".

The second flaw is due to a design error where authenticated users can modify the "header.php" and "footer.php" scripts, which could be exploited by remote attackers to execute arbitrary PHP code with the privileges of the web server.

Affected Products

ACal Project version 2.2.5 and prior

Solution

Upgrade to ACal version 2.2.6 :
http://acalproj.sourceforge.net/download.php

References

http://www.vupen.com/english/advisories/2006/0152
http://evuln.com/vulns/25/summary.html

Credits

Vulnerabilities reported by Aliaksandr Hartsuyeu

ChangeLog

2006-01-11 : Initial release
2006-03-06 : Updated Solution

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