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TUCoPS :: Windows :: hack0108.htm

Windows Unsafe WAV header handling can cause DoS
[HV-LOW] Unsafe WAV header handling can cause DoS on Windows

Hash: SHA1

Unsafe WAV header handling can cause DoS on Windows

Level: [LOW]-med-high-crit
ID: HEXVIEW*2004*10*21*1

A specially crafted WAV file can cause WAV file property handler
to consume all available CPU resources on Windows XP

Affected products:
All tests were performed on the up-to-date version of Windows XP SP1
with all the latest patches and Windows Media Player 10 installed.

Cause and Effect:
Insufficient data validation for WAV file headers causes explorer to enter
an endless loop where it infinitely reads the WAV file.

Below is an invalid WAV file header. Length of the "fmt " chunk is set to
0xFFFFFFFF (offset 0x10) The usual length of "fmt " chunk is 0x12 bytes.
Windows Explorer property handler thread will enter endless loop trying
to read the file.

00000000 52 49 46 46  42 D0 01 00  57 41 56 45  66 6D 74 20 RIFFB...WAVEfmt
00000010 FF FF FF FF  01 00 02 00  22 56 00 00  88 58 01 00 .........V...X..
00000020 04 00 10 00  00 00 66 61  63 74 04 00  00 00 04 74 ......fact.....t
00000030 00 00 64 61  74 61 10 D0  01 00          

Vendor Status:
Vendor has been notified on 2004-10-20. No response received.

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