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                         AUSCERT Security Bulletin

    A vulnerability has been identified in Novell NetWare 6.5 post SP8
                              16 October 2009


        AusCERT Security Bulletin Summary

Product:              Novell Netware 6.5
Operating System:     Netware
Impact/Access:        Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
Member content until: Sunday, November 15 2009


        A vulnerability has been identified in Novell NetWare 6.5 post SP8.


        The vendor has provided the following description of the 
        "This vulnerability allows PKERNEL.NLM's stack buffer to be exceeded, 
        potentially resulting in processor faults, abends, or execution of 
        arbitrary code (for example, due to corrupted code pointers in the 
        stack). Authentication is not required to exploit this vulnerability.
        The specific flaw exists within the processing of CALLIT RPC calls. 
        The vulnerable daemon explicitly trusts a length field when receiving 
        data which is later copied into a stack buffer, potentially resulting 
        in a stack overflow. Successful exploitation of this vulnerability 
        could theoretically lead to remote code execution under the context of 
        the daemon.
        The specific code containing the vulnerability is the implementation 
        of the CALLIT RPC call located in PKERNEL.NLM. The CALLIT RPC call is 
        responsible for forwarding requests to the actual service that it is 
        queried for." [1]


        The vendor has provided a patch to correct this vulnerability which can
        be downloaded from the vendor's website. [1]


        [1] XNFS and PKERNEL post SP8 Updates

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