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Bug 197674 - CVE-2006-2935 Possible buffer overflow in DVD handling
CVE-2006-2935 Possible buffer overflow in DVD handling
Product: Red Hat Enterprise Linux 2.1
Classification: Red Hat
Component: kernel (Show other bugs)
ia64 Linux
medium Severity medium
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Assigned To: Don Howard
Brian Brock
: Security
Depends On:
Blocks: 143573
  Show dependency treegraph
Reported: 2006-07-05 09:49 EDT by Marcel Holtmann
Modified: 2007-11-30 17:06 EST (History)
1 user (show)

See Also:
Fixed In Version: RHSA-2007-0012
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2007-01-17 05:51:05 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Marcel Holtmann 2006-07-05 09:49:37 EDT
Reported by Marcus Meissner to the Kernel Bugzilla:

The dvd_read_bca() function in drivers/cdrom/cdrom.c shows a potential buffer
The variable buf[4+188] is allocated on the stack, however cgc.cmd[9] and
cgc.buflen are set to 255:

cgc.cmd[9] = cgc.buflen = 0xff;
This can be exploited by a custom made USB Storage device and used for local
privilege escalation (aka plug-in this USB device to get root).

This function has been introduced in 2.2.16 (back in 2000) and as of today it
hasn't changed. Jens Axboe confirmed that this is a typo and it should read:

cgc.cmd[9] = cgc.buflen & 0xff;

It is to mask high bits of the length. It doesn't use the high 8 bits for
transfer length, since we are always < 256 for this case.
Comment 4 Mike Gahagan 2006-12-19 18:00:31 EST
There is no practical way to reproduce this that I'm aware of, however I have
verified that the fix is in.

Comment 6 Red Hat Bugzilla 2007-01-17 05:51:05 EST
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

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