OpenBSD Local Malformed Binary Execution Denial of Service Vulnerability

The OpenBSD team has fixed a vulnerability in the OpenBSD kernel when handling certain executables. It appears that the problem lies in the lack of specific sanity checks on binary header values. As a result, a user who constructs a malformed binary and subsequently executes it may trigger a kernel panic.

*** November 5, 2003 - New information discovered by the researcher suggests that the implications of this vulnerability could in fact be higher then initially anticipated. As such, it is believed that successful exploitation of this issue under some conditions could potentially lead to code execution within the context of the kernel. This has been conjectured due to varying crashes observed when triggering the condition. Due to the lack of details regarding this possiblity, the status of this BID will remain the same until more information is available.


 

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