Title: Canna Remote Buffer Overflow Vulnerability
Severity: HIGH
Description:
A vulnerability exists in the 'canna' package, which is distributed with a number of Linux and Unix variants. It is also available for Microsoft Windows. Version 3.5b2 is vulnerable. It is assumed versions prior to this are also vulnerable.
By supplying an overly large username or groupname with the IR_INIT command, it is possible to trigger a remote buffer overflow condition.
Successful exploitation will enable a remote attacker to execute arbitrary code as the user the canna server is running as.
This vulnerability affects any system with 3.5b2 installed. FreeBSD has canna as part of its ports collection. FreeBSD itself does not install canna; as such, this vulnerability does not affect stock distributions of FreeBSD.
Affected Products:
- Caldera OpenLinux Server 3.1.1
- Caldera OpenLinux Workstation 3.1.1
- Canna Canna 3.5.0b2
References:
- UNYUN <shadowpenguin@backsection.net>: [SPS Advisory #38] Canna-cannaserver remote buffer overflow exploit
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