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Trio of bugs bite MS Content Management Server

Buffer overflow, SQL injection and malicious interaction flaws

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A trio of vulnerabilities in Microsoft's Content Management Server (MCMS) has come to light, the most serious of which potentially allows attackers to gain control of victim's machines.

Microsoft has issued a patch - which Redmond characterises as of "critical importance" - designed to fix the problem with Content Management Server 2001 software, Redmond's product for the development and management of e-business Web sites.

First up, and most seriously, there's a buffer overrun flaw in a low-level function that performs user authentication in MCMS 2001. The result of exploiting this vulnerability would be to either cause MCMS to fail, or run code in the context of the MCMS service (which runs as Local System).

Next there's a SQL injection vulnerability affecting a function that services requests for image files and other resources. Exploiting this flaw could enable an attacker to run SQL commands on the server, which would "not only allow data in the MCMS database to be added, changed or deleted, but would also enable the attacker to run operating system commands on the server," Microsoft admits.

Lastly there's a less serious vulnerability that results from the interaction between two flaws related to a function that allows files to be uploaded to MCMS 2001 server. The first flaw lies in how the function authenticates requests, while the other results might permit an attacker to override the designated upload location.

By exploiting these two flaws in tandem, an attacker could upload an .ASP (Active Server Page) or other file to the server, in a location from which it might subsequently be executed.

More detail and these various vulnerabilities and links to Microsoft's patch can be found in its advisory. ®

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