Title: Extremail Buffer Overflow And DNS Spoofing Vulnerabilities
Severity: CRITICAL
Description:
eXtremail is a mail server application.
The application is prone to a buffer-overflow and unspecified DNS-spoofing vulnerabilities. Attackers may be able to cause denial-of-service conditions, execute remote code with superuser privileges, and redirect the vulnerable client to malicious content.
The buffer-overflow occurs when an attacker sends malicious DNS data to trigger this vulnerability. An overly large DNS request followed by malicious code may allow the code to run with superuser privileges. This will facilate the remote compromise of affected computers.
The DNS spoofing vulnerability occurs because the application fails to validate DNS request transaction IDs; an attacker can create false replies and send them to the application over UDP port 53 to trigger this vulnerability.
These issues affect eXtremail 2.1 and 2.1.1; other versions may also be affected.
Affected Products:
- eXtremail eXtremail 2.1
- eXtremail eXtremail 2.1.1
References:
- eXtremail: eXtremail Homepage
- mu-b (mu-bdigit-labs.org): [Full-disclosure] eXtremail-v9
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