Back to list
ACROS Security: Buffer Overflow In EMC (previously Dantz) Retroclient Service
May 22 2006 04:28PM
ACROS Security (lists acros si)
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
Makedonska ulica 113
SI - 2000 Maribor
e-mail: security (at) acrossecurity (dot) com [email concealed]
phone: +386 2 3000 280
fax: +386 2 3000 282
ACROS Security PGP Key
[Fingerprint: FE9E 0CFB CE41 36B0 4720 C4F1 38A3 F7DD]
ACROS Security Advisories
ACROS Security Papers
ASPR Notification and Publishing Policy
The content of this report is purely informational and meant only for the
purpose of education and protection. ACROS d.o.o. shall in no event be
liable for any damage whatsoever, direct or implied, arising from use or
spread of this information. All identifiers (hostnames, IP addresses,
company names, individual names etc.) used in examples and demonstrations
are used only for explanatory purposes and have no connection with any
real host, company or individual. In no event should it be assumed that
use of these names means specific hosts, companies or individuals are
vulnerable to any attacks nor does it mean that they consent to being used
in any vulnerability tests. The use of information in this report is
entirely at user's risk.
May 17, 2006: Initial release
(c) 2006 ACROS d.o.o. Forwarding and publishing of this document is
permitted providing the content between "[BEGIN-ACROS-REPORT]" and
"[END-ACROS-REPORT]" marks remains unchanged.
[ reply ]
Copyright 2010, SecurityFocus