CVE-2019-1794: Cisco Security Advisory: Cisco Directory Connector Search Order Hijacking Vulnerability

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Summary

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• A vulnerability in the search path processing of Cisco Directory Connector could allow an authenticated, local attacker to load a binary of their choosing.

  The vulnerability is due to uncontrolled search path elements. An attacker could exploit this vulnerability by placing a binary of their choosing earlier in the search path utilized by Cisco Directory Connector to locate and load required resources.

  There are workarounds that address this vulnerability.

  This advisory is available at the following link:
  https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190417-cdc-hijack

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Affected Products

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• This vulnerability affects Cisco Directory Connector. For information about affected software releases, consult the Cisco bug ID(s) at the top of this advisory.

  Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.

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Workarounds

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• To ensure that supporting dynamic link libraries (DLLs) are loaded from system locations prior to the user’s current working directory, an administrator can verify SafeDLLSearchMode is enabled in the Windows Registry. This process is outlined in Deployment Guide for Cisco Directory Connector.

  Warning: Incorrectly modifying the system registry of a Microsoft Windows-based device may cause serious problems. Neither Cisco nor Microsoft can guarantee that problems that may result from improper registry modification, either from applying registry changes via a .reg file or by using the Registry Editor, can be resolved. Modify the registry of a system at the user’s own risk.

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Fixed Software

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• For information about fixed software releases, consult the Cisco bug ID(s) at the top of this advisory.

  When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, to determine exposure and a complete upgrade solution.

  In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

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Exploitation and Public Announcements

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• The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

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Source

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• This vulnerability was found during internal security testing.

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Cisco Security Vulnerability Policy

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• To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.

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Related to This Advisory

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URL

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Revision History

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• Version

  Description

  Section

  Status

  Date

  1

  Initial public release.

  -

  2019-Apr-17

  Show Less

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Legal Disclaimer

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• THIS DOCUMENT IS PROVIDED ON AN “AS IS” BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

  A standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. The information in this document is intended for end users of Cisco products.

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