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AUSCERT External Security Bulletin Redistribution
ESB-2020.1619
Cisco Umbrella Carriage Return Line Feed Injection Vulnerability
7 May 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Umbrella
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Provide Misleading Information -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3246
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-umbrella-head-inject-n4QArJH
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Cisco Umbrella Carriage Return Line Feed Injection Vulnerability
Priority: Medium
Advisory ID: cisco-sa-umbrella-head-inject-n4QArJH
First Published: 2020 May 6 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvs93297
CVE-2020-3246
CWE-93
CVSS Score:
4.7 AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X
Summary
o A vulnerability in the web server of Cisco Umbrella could allow an
unauthenticated, remote attacker to perform a carriage return line feed
(CRLF) injection attack against a user of an affected service.
The vulnerability is due to insufficient validation of user input. An
attacker could exploit this vulnerability by persuading a user to access a
crafted URL. A successful exploit could allow the attacker to inject
arbitrary HTTP headers into valid HTTP responses sent to the browser of the
user.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-umbrella-head-inject-n4QArJH
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco Umbrella,
which is cloud based.
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 There are no workarounds that address this vulnerability.
Fixed Software
o Cisco has addressed this vulnerability in Cisco Umbrella, which is cloud
based. No user action is required. Customers can determine the current
remediation status or software version by using the Help function in the
service GUI.
Customers who need additional information 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 Cisco would like to thank Lukasz Korczyk of Epam Systems for reporting this
vulnerability.
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-umbrella-head-inject-n4QArJH
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-MAY-06 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------END INCLUDED TEXT--------------------
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