MBSE BBS mbuseradd.c buffer overflow

mbsebbs-mbuseradd-bo (31639)

High Risk

Description:

MBSE BBS is vulnerable to a stack-based buffer overflow, caused by improper bounds checking in the mbuseradd.c file. By setting an overly long MBSE_ROOT environment variable, a local attacker could overflow a buffer and execute arbitrary code on the system with root privileges.

*CVSS:

Base Score:	7
Access Vector:	Local
Access Complexity:	Low
Authentication:	Not Required
Confidentiality Impact:	Complete
Integrity Impact:	Complete
Availability Impact:	Complete
Temporal Score:	5.8
Exploitability:	Functional
Remediation Level:	Official-Fix
Report Confidence:	Confirmed

Consequences:

Gain Privileges

Remedy:

Upgrade to the latest version of MBSE BBS (0.80 or later), available from the MBSE BBS Web site. See References.

References:

• Full-Disclosure Mailing List, Thu Jan 18 2007 - 09:30:18 CST: mbsebbs 0.70.0 & below local root exploit.
• MBSE BBS Web site: MBSE BBS For Unix.
• BID-22112: MBSE-BBS MBSE_Root Multiple Local Privilege Escalation Vulnerabilites
• CVE-2007-0368: Stack-based buffer overflow in mbse-bbs 0.70 and earlier allows local users to execute arbitrary code via a long string in the MBSE_ROOT environment variable.

Platforms Affected:

• MBSE MBSE BBS 0.70 & prior

Reported:

Jan 18, 2007

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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