OSVDB ID: 17681 Title: NetBSD Multiple Audio Driver Malformed ioctl() Call Local DoS |
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Description |
NetBSD contains a flaw that may allow a local denial of service. The issue is triggered when a malicious attacker uses the set-parameters ioctl call on certain audio devices to change block size and set pause state to "unpaused" in the same ioctl, which will cause a divide-by-zero error resulting in loss of availability for the platform. |
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Location:
Local Access Required
Attack Type: Denial of Service Impact: Loss of Availability Exploit: Exploit Available Disclosure: OSVDB Verified |
Solution |
Upgrade to version 2.0.3 or 2.0.2 after the correction date, as it has been reported to fix this vulnerability. In addition, NetBSD has released a patch for some older versions. It is also possible to correct the flaw by implementing the following workaround: disable access to the audio device for all users. Execute the following commands as root: chown root /dev/audio* /dev/audioctl* /dev/sound* chmod 000 /dev/audio* /dev/audioctl* /dev/sound* |
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