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Category:   OS (UNIX)  >   OpenBSD Kernel Vendors:   OpenBSD
OpenBSD rtlabel_id2name() NULL Return Value Lets Local Users Deny Service
SecurityTracker Alert ID:  1019188
SecurityTracker URL:
CVE Reference:   CVE-2008-0384   (Links to External Site)
Updated:  Jan 28 2008
Original Entry Date:  Jan 14 2008
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.2
Description:   A vulnerability was reported in OpenBSD. A local user can cause denial of service conditions.

Return values from the rtlabel_id2name() function are not properly validated. A local user can cause a NULL value to be returned by using the SIOCGIFRTLABEL ioctl on an interface with no route label assigned to trigger a kernel panic.

Only version 4.2 is affected.

Chris Cappuccio reported this vulnerability.

Impact:   A local user can cause a kernel panic.
Solution:   The vendor has issued a patch, available at:

The OpenBSD advisory is available at:

Vendor URL: (Links to External Site)
Cause:   State error

Message History:   None.

 Source Message Contents

Subject:  errata 005 for OpenBSD 4.2: local users can provoke a kernel panic

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   Improper checks in an ioctl can lead to a kernel panic.

    recently added calls to rtlabel_id2name() for "ifconfig rtlabel"=20
    did not properly check the return value before using it.
    rtlabel_id2name can return NULL if there is no label assigned
    or the ID is invalid.

    local users can cause a kernel panic by using the SIOCGIFRTLABEL
    ioctl on interfaces with no route label assigned.
    ifconfig does not use that ioctl.


    A fix has been committed to OpenBSD-current and the OpenBSD 4.2-stable
    A patch for OpenBSD 4.2 will appear at the URL below shortly.

    Older OpenBSD versions are not affected.

    The bug was found by Chris Cappuccio who also provided an initial=20
    fix.  The final fix was done by Henning Brauer.

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