IBM AIX telnetd can be exploited
| ibm-telnetdos (706) |  Medium Risk |
Description:
Some versions of the AIX telnet daemon are vulnerable to a denial of service attack. A remote attacker can cause the system to run out of message blocks, which denies any further legitimate Telnet sessions from being opened. Exploit information for this hole has been widely distributed.
Platforms Affected:
- IBM, AIX 4.1.1
- IBM, AIX 4.1.2
- IBM, AIX 4.1.3
- IBM, AIX 4.1.4
- IBM, AIX 4.1.5
- IBM, AIX 4.2.0
- IBM, AIX 4.2.1
- IBM, AIX 4.2.1.12
- IBM, AIX 4.3
- IBM, AIX 4.3.1
- IBM, AIX 4.3.2
- IBM, AIX 4.3.3
Remedy:
For IBM AIX 4.1.x:
Apply APAR IX73427 patch, as listed in IBM Emergency Response Service Security Vulnerability Alert ERS-SVA-E01-1998:003.1. See References.
For IBM AIX 4.2.x:
Apply APAR IX73580 patch, as listed in IBM Emergency Response Service Security Vulnerability Alert ERS-SVA-E01-1998:003.1. See References.
For IBM AIX 4.3.0:
Apply APAR IX73214 patch, as listed in IBM Emergency Response Service Security Vulnerability Alert ERS-SVA-E01-1998:003.1. See References.
Consequences:
Denial of Service
References:
- CIAC Information Bulletin I-029, IBM AIX Telnet Denial-of-Service Vulnerability at http://www.ciac.org/ciac/bulletins/i-029.shtml.
- IBM Technical Support Web site, AIX General Software Fixes at http://www-03.ibm.com/servers/eserver/support/unixservers/aixfixes.html.
- CVE-1999-0087: Denial of service in AIX telnet can freeze a system and prevent users from accessing the server.
- OSVDB ID: 7992: AIX telnet Login Remote DoS
Reported:
Feb 11, 1998
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