Title: Mutt NULL Character CA SSL Certificate Validation Security Bypass Vulnerability
Severity: CRITICAL
Description:
Mutt is a freely available, open-source mail client. It is available for UNIX, Linux, and other UNIX-like operating systems.
The application is prone to a security-bypass vulnerability because it fails to properly validate the domain name in a signed CA certificate. Specifically, the application stops reading the domain name when it encounters a NULL character. However, an attacker can acquire a legitimate certificate for a subdomain that contains a NULL character. Such a subdomain may look like 'example.net\0example.com' where the attacker owns 'example.com' and wishes to impersonate 'example.net'.
Successful exploits allow attackers to perform man-in-the-middle attacks or impersonate trusted servers, which will aid in further attacks.
Mutt 1.5.20 is vulnerable; other versions may also be affected.
Affected Products:
- Linux kernel 2.6.5
- Mutt Mutt 1.5.19
- Mutt Mutt 1.5.20
- S.u.S.E. SUSE Linux Enterprise Server 10 SP2
- S.u.S.E. SUSE Linux Enterprise Server 11
- S.u.S.E. SUSE Linux Enterprise Server 9
- S.u.S.E. openSUSE 10.3
- S.u.S.E. openSUSE 11.0
- S.u.S.E. openSUSE 11.1
References:
- Mutt: Mutt Homepage
- Tomas Hoger: Changeset 6016:dc09812e63a3 for mutt_ssl.c
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