NOVELL ZENWORKS MULTIPLE REMØTE STACK & HEAP OVERFLOWS

[list () rem0te com]

Date
May 18, 2005

Vulnerabilities
Novell ZENworks provides Remote Management capabilities to large networks. In order to manage remote nodes ZENworks 
implements an authentication protocol to verify the requestor is authorized for a transaction. This authentication 
protocol contains several stack and heap overflows that can be triggered by an unauthenticated remote attacker to 
obtain control of the system that requires authentication. These overflows are the result of unchecked copy values, 
sign misuse, and integer wraps.

There are several arbitrary heap overflows with no character restrictions that are the result of integer wraps. These 
integer wraps occur because words from the network are sign extended and then incremented. The results of these 
calculations are passed to new(0). Input of -1 to these calculations will result in small memory allocations and 
negative length receives to overflow the allocated memory.

There is an arbitrary stack overflow with no character restrictions in the authentication negotiation for type 1 
authentication requests. The stack overflow is a result of an unchecked password length used as the copy length for the 
password to a stack variable only 0x1C bytes long.

There are several arbitrary stack overflows with no character restrictions in the authentication negotiation for type 2 
authentication requests. All are the result of unchecked lengths being used to copy arbitrary network data to an 
argument that is a stack variable of the caller. These lengths also contain integer wraps and sign misuse issues.

Impact
Successful exploitation of ZENworks allows attackers unauthorized control of related data and privileges on the machine 
and network. It also provides attackers leverage for further network compromise. Most likely the ZENworks 
implementation will be vulnerable in its default configuration.

Affected Products
All versions of Novell ZENworks are vulnerable. If the authentication negotiation is used in other products, they are 
also likely to be vulnerable. Refer to Novell for specifics.

Advisories:
http://www.rem0te.com/public/images/zen.pdf
http://support.novell.com/cgi-bin/search/searchtid.cgi?/10097644.htm

Credit
These vulnerabilities were discovered and researched by Alex Wheeler.

Contact
security () rem0te com






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