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AUSCERT External Security Bulletin Redistribution
ESB-2019.1336
Cisco Directory Connector Search Order Hijacking Vulnerability
18 April 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Directory Connector
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1794
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190417-cdc-hijack
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Cisco Directory Connector Search Order Hijacking Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20190417-cdc-hijack
First Published: 2019 April 17 16:00 GMT
Version 1.0: Final
Workarounds: Yes
Cisco Bug IDs: CSCvk22605
CVE-2019-1794
CWE-427
CVSS Score:
5.1 AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:N/E:X/RL:X/RC:X
Summary
o 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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190417-cdc-hijack
Affected Products
o Vulnerable Products
This vulnerability affects Cisco Directory Connector. For information about
affected software releases, consult the Cisco bug ID(s) at the top of this
advisory.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Workarounds
o 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.
Fixed Software
o 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.
Exploitation and Public Announcements
o 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.
Source
o This vulnerability was found during internal security testing.
Cisco Security Vulnerability Policy
o 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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190417-cdc-hijack
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1 | Initial public release. | - | | 2019-Apr-17 |
+----------+---------------------------+----------+--------+--------------+
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