OpenBSD file descriptor denial of service
| openbsd-file-descriptor-dos (9048) |  Medium Risk |
Description:
OpenBSD is vulnerable to a denial of service attack. A local attacker could fill the kernel file descriptor table by causing a process to create pipes in a loop, which would cause a denial of service against all users except for the one performing the attack.
Consequences:
Denial of Service
Remedy:
For OpenBSD 2.9:
Apply the patch for this vulnerability, as listed in OpenBSD Security FIX - 026, May 8, 2002. See References.
For OpenBSD 3.0:
Apply the patch for this vulnerability, as listed in OpenBSD Security FIX - 021, May 8, 2002. See References.
For OpenBSD 3.1:
Apply the patch for this vulnerability, as listed in OpenBSD Security FIX - 003 , May 8, 2002. See References.
For Caldera OpenUnix 8.0.0:
Apply the g712059.ou8 patch, as listed in SCO Security Advisory CSSA-2002-SCO.43. See References.
For Caldera UnixWare 7.1.1:
Apply the erg712059.711 patch, as listed in SCO Security Advisory CSSA-2002-SCO.43. See References.
References:
- BugTraq Mailing List, Thu May 09 2002 - 08:11:31 CDT: OpenBSD local DoS and root exploit.
- BugTraq Mailing List, Thu May 09 2002 - 10:27:40 CDT: Re: OpenBSD local DoS and root exploit.
- OpenBSD 2.9 errata: 026: SECURITY FIX: May 8, 2002.
- OpenBSD 3.0 errata: 021: SECURITY FIX: May 8, 2002.
- OpenBSD 3.1 errata: 003: SECURITY FIX: May 8, 2002.
- SCO Security Advisory CSSA-2002-SCO.43: closed file descriptor race vulnerability.
- BID-4708: Multiple Vendor exec C Library Standard I/O File Descriptor Race Condition Vulnerability
- CVE-2002-0766: OpenBSD 2.9 through 3.1 allows local users to cause a denial of service (resource exhaustion) and gain root privileges by filling the kernel's file descriptor table and closing file descriptors 0, 1, or 2 before executing a privileged process, which is not properly handled when OpenBSD fails to open an alternate descriptor.
- OSVDB ID: 5114: OpenBSD Kernel File Descriptor Table DoS
- OSVDB ID: 5715: OpenBSD Kernel File Descriptor Table Privilege Escalation
- US-CERT VU#314963: OpenBSD kernel fails to properly check closed file descriptors 0-2 when running setuid program
Platforms Affected:
- OpenBSD OpenBSD 2.9
- OpenBSD OpenBSD 3.0
- OpenBSD OpenBSD 3.1
- SCO Caldera OpenUnix 8.0.0
- SCO Caldera UnixWare 7.1.1
Reported:
May 09, 2002
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