Software Engineering Institute

Computer Associates BrightStor ARCserve Backup products come with a service called LGSERVER.EXE. This service listens on ports 2200/tcp and 1900/tcp. The LGSERVER.EXE process fails to properly validate data packets received on port 1900/tcp, which can cause a stack buffer overflow. According to Computer Associates CAID 34993, the following products are affected

BrightStor ARCserve:

BrightStor ARCserve Backup for Laptops and Desktops r11.1 SP1
BrightStor ARCserve Backup for Laptops and Desktops r11.1
BrightStor ARCserve Backup for Laptops and Desktops r11.0
BrightStor Mobile Backup r4.0

CA Desktop Protection Suite r2
CA Business Protection Suite r2
CA Business Protection Suite for Microsoft Small Business Server Standard Edition r2
CA Business Protection Suite for Microsoft Small Business Server Premium Edition r2

DMS r11.0
DMS r11.1

A remote, unauthenticated attacker may be able to execute arbitrary code with local SYSTEM privileges or cause a denial-of-service condition on a vulnerable system.

Apply an update
Apply an update, as specified in Computer Associates Security Notice. The following fixes are provided

BABLD r11.1 SP2 – SP2 does not contain the vulnerability, there is no fix to apply
BABLD r11.1 SP1 - QO83833
BABLD r11.0 - QI85497
DMS r11.1 - QO85401
DMS r11.0 - QI85423
BMB r4.0 - QO85402

Restrict access

You may wish to block access to the vulnerable software from outside your network perimeter, specifically by blocking access to the ports used by the Discovery Service (typically 2200/tcp and 1900/tcp). This will limit your exposure to attacks. However, blocking at the network perimeter would still allow attackers within the perimeter of your network to exploit the vulnerability. The use of host-based firewalls in addition to network-based firewalls can help restrict access to specific hosts within the network. It is important to understand your network's configuration and service requirements before deciding what changes are appropriate.