October 2005

ID: 00962
Ref: 900/05
Date: 31 October 2005:10:24:17
Version: 1

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Title: SCO - OpenServer 6.0.0 : RPCBind Remote Denial of Service Vulnerability [SCOSA-2005.43]
Abstract: When the RPC portmapper (rpcbind) receives an invalid portmap request from a remote (or local) host, it falls into a denial of service state and cannot respond. As a result, the RPC services will not operate normally.
Vendors affected: SCO
Applications affected: SCO

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Title
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SCO - OpenServer 6.0.0 : RPCBind Remote Denial of Service Vulnerability [SCOSA-2005.43]


Detail
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______________________________________________________________________________

SCO Security Advisory

Subject: OpenServer 6.0.0 : RPCBind Remote Denial of Service Vulnerability
Advisory number: SCOSA-2005.43
Issue date: 2005 October 27
Cross reference: sr895067 erg712957 fz533036 CAN-2005-2132
______________________________________________________________________________


1. Problem Description

When the RPC portmapper (rpcbind) receives an invalid portmap
request from a remote (or local) host, it falls into a denial
of service state and cannot respond. As a result, the RPC
services will not operate normally.

The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CAN-2005-2132 to this issue.


2. Vulnerable Supported Versions

System Binaries
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OpenServer 6.0.0 /usr/lib/libnsl.so.1


3. Solution

The proper solution is to install the latest packages.


4. OpenServer 6.0.0

4.1 Location of Fixed Binaries

ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.43


4.2 Verification

MD5 (VOL.000.000) = 5086254532a3d202f526de0b6d343e66

md5 is available for download from
ftp://ftp.sco.com/pub/security/tools


4.3 Installing Fixed Binaries

Upgrade the affected binaries with the following sequence:

1) Download the VOL* files to a directory

2) Run the custom command, specify an install from media
images, and specify the directory as the location of the
images.


5. References

Specific references for this advisory:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2132

SCO security resources:
http://www.sco.com/support/security/index.html
SCO security advisories via email
http://www.sco.com/support/forums/security.html

This security fix closes SCO incidents sr895067 erg712957 fz533036.


6. Disclaimer

SCO is not responsible for the misuse of any of the information
we provide on this website and/or through our security
advisories. Our advisories are a service to our customers
intended to promote secure installation and use of SCO
products.


7. Acknowledgments

The SCO Group would like to thank Yun Jonglim for his work
in discovering and describing this defect so well.

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