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Date: Wed, 31 Jan 2007 01:52:52 -0000
From: "NGS Software Insight Security Research" <>
To: <>, <>,
Subject: Remote Unauthenticated Code Execution II CA BrightStor ARCserve Backup for Laptops & Desktops 

Today: 31 January 2007
Reference: NGS00403
Discover: Mark Litchfield
Name: Remote Unauthenticated Code Execution II CA BrightStor ARCserve Backup 
for Laptops & Desktops r11.1
Vendor: Computer Associates
Systems Affected: BrightStor ARCserve Backup for Laptops & Desktops r11.1
Risk: Critical
Status: Published

Discovered: 23 June 2006
Released: 23 June 2006
Approved: 23 June 2006
Reported: 22 June 2006
Fixed: 23 January 2007
Published: 30 January 2007

By sending a specially crafted packet to the LGSERVER.EXE process that
listens on TCP port 1900, it is possible to cause a stack overflow that
allows arbitrary code execution as Local System.

Technical Details
The format of the packet that's sent to LGSERVER.EXE that listens on TCP
port 1900 is as follows:


where dddddddddd is a ten-character long zero-padded decimal value
equating to the length of xxxxxxxxxxxxxxxxxxxxx (ATOI). If dddddddddd is
set to 0000032767 and xxxxxxxxxxxxxxxxxxxxx is set appropriately, a stack
buffer is overwritten, and it is possible to gain control of execution. By
default on Windows, LGSERVER.EXE (the Mobile Backup Service) runs as Local

Fix Information

NGSSoftware Insight Security Research
+44(0)208 401 0070


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