Title: W3M Malformed MIME Header Buffer Overflow Vulnerability
Severity: HIGH
Description:
W3M is a pager/text-based WWW browser similar to lynx.
The 'w3m' client program contains a boundary condition error in its handling of HTTP header fields.
A buffer overflow can occur when a base64-encoded string is received in a MIME header field. The string is copied into an internal buffer without performing bounds checking. If the string exceeeds approximately 32 characters in length, the extraneous data overwrites neighbouring memory.
If successful, an attacker can have arbitrary code executed with the privileges of the user running the w3m client.
Affected Products:
- Conectiva Linux 5.0.0
- Conectiva Linux 5.1.0
- Conectiva Linux 6.0.0
- Conectiva Linux 7.0.0
- RedHat Linux 7.0.0
- RedHat Linux 7.0.0 i386
- RedHat Linux 7.2.0
- RedHat Linux 7.2.0 i386
- RedHat Linux 7.2.0 ia64
- W3M W3M 0.1.10
- W3M W3M 0.1.3
- W3M W3M 0.1.4
- W3M W3M 0.1.6
- W3M W3M 0.1.7
- W3M W3M 0.1.8
- W3M W3M 0.1.9
- W3M W3M 0.2.0
- W3M W3M 0.2.1
References:
- W3M: W3M Homepage
- W3M: [w3m-dev 02066] mime header decode
- W3M: [w3m-dev 02067] Re: mime header decode
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