Title: PGPMail Remote Command Execution Vulnerability
Severity: HIGH
Description:
PGPMail is a modified version of Matt Wright's FormMail 1.5, allowing mail to be encrypted using PGP.
PGPMail is prone to a vulnerability which may allow arbitrary commands to be executed on the shell of a host running it. This is due to insufficient validation of data in hidden form fields. Commands will be executed with the privileges of the webserver. There are at least two instances in the PGPMail.pl script where shell metacharacters are not adequately filtered from hidden form fields(recipient and pgpuserid).
Although PGPMail does include the security feature of checking the HTTP Referrer against a list of trusted hosts, this vulnerability could be trivially exploited if the HTTP Referrer field of a web request is forged by the attacker.
Successful exploitation may allow the attacker to gain local access to the host.
Affected Products:
- Matt Wright FormMail 1.5.0
- Matt Wright FormMail 1.6.0
- PGPMail PGPMail 1.3.0 00
- PGPMail PGPMail 1.3.1
References:
- Venturablvd: PGPMail Homepage
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