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Linux Orinoco drivers information leakage
From: Meder Kydyraliev <meder () o0o nu>
Date: Wed, 12 Oct 2005 14:34:59 +0800

          Linux Orinoco Driver Information Leakage Vulnerability

I. Background


The Linux orinoco driver, included in the kernel since 2.4.3 and in David
Hinds' pcmcia-cs package since 3.1.30 supports a large number of wireless NICs
based on the Lucent/Agere Hermes, Symbol Spectrum24 and Intersil/Conexant
Prism 2/2.5/3 chipsets.

II. Description

Due to padding of Ethernet frames with uninitialized data, it is possible to
remotely obtain parts of memory which may contain sensitive information [1].

Following sample dumps illustrate the problem:

13:21:58.901746 arp reply is-at 00:09:5b:3e:ca:d4
        0x0000:  0001 0800 0604 0002 0009 5b3e cad4 c0a8  ..........[>....
        0x0010:  00b3 0012 f0bb 22ae c0a8 001f 6f73 743a  ......".....ost:
        0x0020:  7e20 2d20 5368 656c 6c20 4e6f 2e20 7353  ~.-.Shell.No..sS
        0x0030:  8071                                     .q

13:21:17.811889 arp reply is-at 00:09:5b:3e:ca:d4
        0x0000:  0001 0800 0604 0002 0009 5b3e cad4 c0a8  ..........[>....
        0x0010:  00b3 0012 f0bb 22ae c0a8 001f 2054 7261  ......"......Tra
        0x0020:  636b 3035 2e6d 7033 2028 343a 3139 1b62  ck05.mp3.(4:19.b
        0x0030:  6dd1                                     m.

Attacker can use arping(8) to send ARP requests to the target running
vulnerable orinoco drivers and observe contents of uninitialized memory in
the ARP replies.

III. Vendor status 

Developers of linux orinoco drivers where notified and the fix, which has been
incorporated into kernel, was issued.

Patch can be viewed here:

IV. Disclosure timeline
4/10/2005 - Issue discovered. Vendor notified.
4/10/2005 - Vendor response received along with the patch to remedy the problem.
10/10/2005 - Confirmed that patch was incorporated into kernel.

V. Acknowledgements

Thanks to Pavel Roskin for quick response and fix.

VI. References

1. http://www.atstake.com/research/advisories/2003/atstake_etherleak_report.pdf

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