FreeBSD syscons Input Validation Flaw May Disclose Kernel Memory to Local Users
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SecurityTracker Alert ID: 1011526
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SecurityTracker URL: http://securitytracker.com/id?1011526
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CVE Reference: CAN-2004-0919
(Links to External Site)
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Date: Oct 4 2004
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Impact: Disclosure of authentication information, Disclosure of system information, Disclosure of user information
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Fix Available: Yes
Vendor Confirmed: Yes
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Version(s): FreeBSD 5.x
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Description: A vulnerability was reported in FreeBSD in syscons. A local user may be able to view portions of kernel memory.
The vendor reported that the syscons CONS_SCRSHOT ioctl(2) does not properly validate user-supplied inputs. A local user can supply
specially crafted inputs, such as negative coordinates or large coordinates to trigger the flaw.
A local user on the physical
console or a user with privileges to open a /dev/ttyv* device node can exploit the flaw.
Christer Oberg is credited with reporting
this vulnerability.
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Impact: A local user may be able to view portions of kernel memory.
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Solution: The vendor has issued a fix, available via CVS:
http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/dev/syscons/syscons.c#rev1.429
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Vendor URL: www.freebsd.org/ (Links to External Site)
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Cause: Input validation error
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Underlying OS: UNIX (FreeBSD)
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Message History:
None.
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Source Message Contents
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Date: Mon, 4 Oct 2004 14:44:49 -0400
Subject: [none]
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CVE: CAN-2004-0919
A vulnerability was reported in FreeBSD in syscons. The syscons CONS_SCRSHOT ioctl(2)
does not properly validate user-supplied inputs. A local user can supply specially
crafted inputs, such as negative coordinates or large coordinates to trigger the flaw.
A local user on the physical console or a user with privileges to open a /dev/ttyv*
device node can exploit the flaw.
Christer Oberg is credited with reporting this vulnerability.
A fix is available via CVS:
http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/dev/syscons/syscons.c#rev1.429
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