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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2002.540 -- Microsoft Security Bulletin MS02-057 Flaw in Services for Unix 3.0 Interix SDK Could Allow Code Execution (Q329209) 03 October 2002 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Services for Unix 3.0 Interix SDK Vendor: Microsoft Operating System: Windows Impact: Execute Arbitrary Code/Commands Denial of Service Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- - - ---------------------------------------------------------------------- Title: Flaw in Services for Unix 3.0 Interix SDK Could Allow Code Execution (Q329209) Released: 02 October 2002 Software: Services for Unix 3.0 Interix SDK Impact: Buffer overrun and denial of service Max Risk: Moderate Bulletin: MS02-057 Microsoft encourages customers to review the Security Bulletin at: http://www.microsoft.com/technet/security/bulletin/MS02-057.asp. - - ---------------------------------------------------------------------- Issue: ====== All three vulnerabilities discussed in this bulletin involve the inclusion of the Sun [TM] Microsystems RPC library in Microsoft's Services for UNIX (SFU) 3.0 on the Interix SDK. Developers who created applications or utilities using the Sun RPC library from the Interix SDK need to evaluate three vulnerabilities. Windows Services for UNIX (SFU) 3.0 provides a full range of cross- platform services to integrate Windows into existing UNIX environ- ments. In version 3.0, the Interix subsystem technology is built in so that Windows Services for UNIX 3.0 can provide platform inter- operability and application migration in one fully integrated and supported product from Microsoft. Developers who have integrated Windows into their existing UNIX environments may have used the Interix SDK to develop custom applications and utilities so that applications that only ran on the UNIX platform can now run in a Windows environment. Developers who used the Interix SDK to develop applications or utilities should read this bulletin. The first vulnerability is an integer overflow in the XDR library that ships with the Sun RPC library on the Interix SDK for Microsoft's Services for Unix (SFU) 3.0. An attacker could send a malicious RPC request to the RPC server from a remote machine and cause corruption in the server program. This can cause the server to fail and potentially allow the attacker to run code of his or her choice in the context of the server program. The second vulnerability is a buffer overrun. An attacker could send a malicious RPC request to the RPC server with an improper parameter size check. This could lead to a buffer overrun, causing the server to fail and preventing it from servicing any further requests from clients. The third vulnerability is an RPC implementation error. An app- Lication using the Sun RPC library does not properly check the size of client TCP requests. This could result in a denial of service to a server application using the Sun RPC library. The RPC library expects client TCP requests to specify the size of the record that follows. Because there is a flaw in the way RPC detects client packets, an attacker could send a malformed RPC request to the RPC server from a remote machine and cause the server to fail by not servicing any further client requests. After applying the patch, it is necessary to recompile any Interix application that is statically linked with the Interix SDK Sun RPC library. Mitigating Factors: ==================== * Only applications or utilities that were created using the Interix SDK and specifically that use the Sun RPC library, would be affected by these vulnerabilities. * If an administrator or developer has only installed the Interix SDK but has not actually created applications with the SDK that use the Sun RPC library, the systems where the SDK was installed would not be vulnerable. Risk Rating: ============ - Internet systems: Moderate - Intranet systems: Moderate - Client systems: Moderate Patch Availability: =================== - A patch is available to fix this vulnerability. Please read the Security Bulletin at http://www.microsoft.com/technet/security/bulletin/ms02-057.asp for information on obtaining this patch. - - --------------------------------------------------------------------- THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. - -----BEGIN PGP SIGNATURE----- Version: PGP 7.1 iQEVAwUBPZtve40ZSRQxA/UrAQHdXgf/ejvlfeHIg3/qqRNVr05cITb88aElEzmS 54vEwb1h9YXhMzMBwm4nXyFLcG97wxJdWSUFkqKx8gzQtlJazOzCFHCKKCC1wU3Y teNZJY0D/xEgkRTaYeeEIqNqTq6646M4dHmhFlyfLPLz5Ak50lpeGAk3ZyMPnfl8 uhypyBCy+1CmuxQE3RNMHw2Orz5jIwKWVYRjhfgQH11U537rCCW2cePadxYoDVpz VyR1iHTDo5bvZa7101qMb06rftijbAKRF4049USw14dd6v/0FxxmjfXu2w9ECL1U zwvrt8MaOWRPw/vt+kbF7kRFIDSUVuTN4xlf2kSC+zIOKdluvelhgw== =Y+ML - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to use any or all of this information is the responsibility of each user or organisation, and should be done so in accordance with site policies and procedures. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the original authors to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/Information/advisories.html If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBPZyLxCh9+71yA2DNAQFZHAP8CmU8ignI9TZ81nOPZgMU9N1psdvBn6T2 BtHw3lzfm7L+NAAz+wNrfqGggnnqTTgKtCghUdGOmqKgS+7+2fw/6Y1q0bnvW/MM auZ2GVTO+I0PjOseVu0kdszHzRP6/9oVYIcnQqIdFtQyUQBLAy+7N7L8QHSS0hft UH/8+2BcptQ= =anot -----END PGP SIGNATURE-----