========================================================================ACROS Security Problem Report #2006-05-17-1
ASPR #2006-05-17-1: Buffer Overflow In Retroclient Service
Document ID: ASPR #2006-05-17-1-PUB
Vendor: EMC (http://www.emc.com)
Target: Retrospect 7.5 Client for Windows
Impact: A buffer overflow vulnerability in Retroclient service
can be exploited to crash Retrospect clients in the
Status: Official patch available
Discovered by: Luka Treiber of ACROS Security
We would like to acknowledge Eric Baize and Jamie Albertson from EMC
for extremely diligent and professional handling of the identified
A buffer overflow vulnerability in Retroclient service can be exploited
to crash Retrospect clients in the network. This enables an attacker to
easily disable the backup process throughout an organization.
- Retrospect 7.5 Client for Windows - affected
Older versions are likely to be affected as well.
Altering content of one of the packets sent to the client during server-
client communication can result in a buffer overflow condition, which
crashes the client service.
Consequently, the automated backup process on the affected client no
longer works. Moreover, under specific circumstances this vulnerability
could be exploited for executing arbitrary code on the system running
the Retrospect client.
Note that access to corporate network is needed for exploiting this
vulnerability as it requires an attacker to establish a network
connection to a vulnerable client.
The attacker is connected to a corporate network with his laptop. Using a
port scanner, she locates machines with port 497 open, indicating the
presence of Retroclient service. Using her malicious tool she mimics
Retrospect server's behavior: simultaneously the tool connects to
enumerated clients and sends them malicious data as described in the
analysis above, which results in their crashing. In a short period of
time all Retrospect clients in the network are disabled.
EMC has issued a security bulletin  and published a patch
which fixes this issue.
- We're not aware of any efficient workarounds for this issue.
 EMC Retrospect Knowledgebase
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fax: +386 2 3000 282
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May 17, 2006: Initial release
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