I/O Signal handling can result in DoS
| openbsd-iosig (556) |  Medium Risk |
Description:
OpenBSD is vulnerable to a denial of service attack in the way it handles certain I/O signals. This vulnerability allows unprivileged users to send signals to arbitrary processes or programs on the system and interrupt its operation, or even kill the process.
Platforms Affected:
- FreeBSD, FreeBSD
- NetBSD, NetBSD
- OpenBSD, OpenBSD 2.1
- SGI, IRIX
- WindRiver, BSDOS
Remedy:
Contact your vendor for a patch. OpenBSD users are encouraged to upgrade to version 2.2 or later.
Consequences:
Denial of Service
References:
- OpenBSD Security Advisory, September 15, 1997, Vulnerability in I/O Signal Handling at http://www.openbsd.com/advisories/signals.txt.
- CVE-1999-1214: The asynchronous I/O facility in 4.4 BSD kernel does not check user credentials when setting the recipient of I/O notification, which allows local users to cause a denial of service by using certain ioctl and fcntl calls to cause the signal to be sent to an arbitrary process ID.
- OSVDB ID: 11062: Multiple BSD Kernel Asynchronous I/O Facility Notification DoS
Reported:
Sep 01, 1997
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