Title: Cisco PIX Firewall SMTP Content Filtering Evasion Vulnerability Re-Introduction
Severity: HIGH
Description:
Like other firewalls, the Cisco PIX Firewall implements technology that reads the contents of packets passing through it for application-level filtering.
In the case of SMTP, PIX firewalls can be configured so only certain smtp commands can be allowed through (for example, dropping extra functionality, such as HELP or commands that could be a security concern, like EXPN or VRFY).
An old vulnerability that allowed for bypassing of this filtering has been re-introduced into PIX firmware. This vulnerability is archived in the SecurityFocus vulnerability database as Bugtraq ID: 1698.
Exploitation of this vulnerability may allow for remote attackers to send possibly malicious commands to an smtp server behind the firewall.
Affected Products:
- Cisco PIX Firewall 4.4.0(4)
- Cisco PIX Firewall 4.4.0(7.202)
- Cisco PIX Firewall 5.1.0(4.206)
- Cisco PIX Firewall 5.2.0(3.210)
- Cisco PIX Firewall 6.0.0 (1)
References:
- Cisco Systems: Cisco PIX Firewall Product Homepage
- Cisco Systems: Cisco Secure PIX Firewall SMTP Filtering Vulnerability
- SecurityFocus: Cisco PIX Firewall SMTP Content Filtering Evasion Vulnerability
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