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Cert Advisory 2002-03 and HP JetDirect
From: Information Security <InformationSecurity () federatedinv com>
Date: Tue, 19 Feb 2002 10:53:48 -0500
It appears that HP JetDirect firmware is more susceptible to SNMP
vulnerabilities than originally referenced in the CERT Advisory CA-2002-03
(http://www.cert.org/advisories/CA-2002-03.html). Some basic testing with
Protos on an internal network seems to indicate that devices with JetDirect
firmware x.08.32 crash each time a single malformed SNMP packet is received.
The HP Download Manager for JetDirect reports that the printer software is
On the hardware I tested, the packet generated an "EIO" error and required
the device to be powered off to recover. Control panel input was not
The packet can be generated using the req-enc protos test with the options
"-zerocase -showreply -single 13771". The protos test name is
"set-req-ber-l-length" in the category of "Invalid BER length (L) fields".
The TCPDump trace is:
15:43:38.979321 126.96.36.199.1890 > 188.8.131.52.161:
15:43:39.179098 184.108.40.206.1891 > 220.127.116.11.161:
As an interesting side note, Ethereal (a popular open source sniffer /
traffic analyzer) crashes every time it sees this packet also. It gives the
error "GLib-ERROR **: could not allocate -1 bytes aborting...".
This testing has been very limited (only LaserJet 4si and 8150 series
printers were tested), so please post your test results Bugtraq.
- Cert Advisory 2002-03 and HP JetDirect Information Security (Feb 19)