OpenBSD 4.2 allows local users to cause a denial of service (kernel panic) by calling the SIOCGIFRTLABEL IOCTL on an interface that does not have a route label, which triggers a NULL pointer dereference when the return value from the rtlabel_id2name function is not checked.
CVSS Severity (version 2.0):
Impact Subscore: 6.9
Exploitability Subscore: 3.9
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows disruption of service
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[4.2] 20080111 005: RELIABILITY FIX: January 11, 2008
[openbsd-security-announce] 20080111 errata 005 for OpenBSD 4.2: local users can provoke a kernel panic
Vulnerable software and versions