Title: Horde IMP Message Attachment Symbolic Link Vulnerability
Severity: HIGH
Description:
IMP is a powerful web-based mail interface/client developed by members of the Horde project.
IMP makes insecure use of temporary filenames, allowing an attacker to carry out symbolic link attacks. Imp creates temporary filenames in processing files attached to mail messages.
These files are named using a predictable pattern: /tmp/phpXXXXXX
As well, when opening attached files using an external viewer, IMP creates temporary files matching this pattern:
/tmp/imp.'.date('Y-M-D_H:i:s').'__'.md5($contents).
If an attacker can successfully anticipate the name of Imp's temporary file prior to its creation, a symbolic link could be created pointing to a target file writable by the webserver process.
In this event, Imp will overwrite the contents of the target file with its own output.
Affected Products:
- Caldera OpenLinux Server 3.1.0
- Horde Horde 1.2.0
- Horde Horde 1.2.1
- Horde Horde 1.2.2
- Horde Horde 1.2.3
- Horde Horde 1.2.4
- Horde IMP 2.0.0
- Horde IMP 2.2.0
- Horde IMP 2.2.1
- Horde IMP 2.2.2
- Horde IMP 2.2.3
- Horde IMP 2.2.4
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