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Vulnerability Note VU#611276Computer Associates BrightStor ARCserve Backup LGSERVER.EXE stack buffer overflowOverviewComputer Associates BrightStor ARCserve Backup contains a stack buffer overflow, which may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.I. DescriptionComputer 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 affectedBrightStor ARCserve:
BrightStor ARCserve Backup for Laptops and Desktops r11.1 BrightStor ARCserve Backup for Laptops and Desktops r11.0 BrightStor Mobile Backup r4.0
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 r11.1 II. ImpactA 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.III. SolutionApply an updateApply an update, as specified in Computer Associates Security Notice. The following fixes are provided
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. Systems Affected
References
This vulnerability was disclosed by Computer Associates, who in turn credit NGSS. This document was written by Will Dormann.
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