Title: AIX SIGIO and SIGURG Signals Vulnerability
Severity: MODERATE
Description:
Under certain versions of AIX processes may receive SIGIO or SIGURG signals from other unrelated processes. The processes receiving the signals may exit unexpectedly. This could allow malicious users to kill processes which were not their own. This is a problem many OS's have been found to suffer from. In addition to being an extremely potent denial of service attack, surgical application of this vulnerability can be used to compromise the system - for example, a process holding a bound address (NFS port 2049, for instance) can be killed off and it's port stolen; this can be used to steal NFS file handles.
This problem was fixed by adding code to sockets subsystem to only allow SIGIO and SIGURG signals to processes with the same UID as the process that called the SIOCSPGRP ioctl.
Affected Products:
- IBM AIX 4.1.0
- 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 4.3.0
References:
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