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AUSCERT External Security Bulletin Redistribution
ESB-2021.1174
Cisco Umbrella Link and CSV Formula Injection Vulnerabilities
8 April 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Umbrella
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Provide Misleading Information -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1475 CVE-2021-1474
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-umbrella-inject-gbZGHP5T
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Cisco Umbrella Link and CSV Formula Injection Vulnerabilities
Priority: Medium
Advisory ID: cisco-sa-umbrella-inject-gbZGHP5T
First Published: 2021 April 7 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvx27753 CSCvx28555
CVE Names: CVE-2021-1474 CVE-2021-1475
CWEs: CWE-1236 CWE-74
Summary
o Multiple vulnerabilities in the Admin audit log export feature and
Scheduled Reports feature of Cisco Umbrella could allow an authenticated,
remote attacker to perform formula and link injection attacks on an
affected device.
For more information about these vulnerabilities, see the Details section
of this advisory.
Cisco has released software updates that address these vulnerabilities.
There are no workarounds that address these vulnerabilities.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-umbrella-inject-gbZGHP5T
Affected Products
o Vulnerable Products
These vulnerabilities affect 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 these vulnerabilities.
Details
o The vulnerabilities are not dependent on one another. Exploitation of one
of the vulnerabilities is not required to exploit the other vulnerability.
In addition, a software release that is affected by one of the
vulnerabilities may not be affected by the other vulnerability.
Details about the vulnerabilities are as follows.
CVE-2021-1474: Cisco Umbrella CSV Formula Injection Vulnerability
A vulnerability in the Admin audit log export feature of Cisco Umbrella
could allow an authenticated, remote attacker to perform a formula
injection attack on an affected device.
This vulnerability is due to improper neutralization of formula elements in
the comma-separated value (CSV) file that is generated by the Admin audit
log export feature. An attacker could exploit this vulnerability by
performing certain actions that would lead to an injection of malicious
entries into the log. A successful exploit could allow the attacker to
inject malicious formula elements into the CSV file. These elements would
be executed when a user opens the CSV file with a spreadsheet application,
which could lead to manipulation of the data in the CSV file or code
execution on the computer of the user.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
Bug ID(s): CSCvx27753
CVE ID: CVE-2021-1474
Security Impact Rating (SIR): Medium
CVSS Base Score: 6.5
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
CVE-2021-1475: Cisco Umbrella Link Injection Vulnerability
A vulnerability in the Scheduled Reports feature of Cisco Umbrella could
allow an authenticated, remote attacker to perform a link injection attack
on an affected device.
This vulnerability is due to improper neutralization of user-supplied
input. An attacker could exploit this vulnerability by scheduling a report
with a crafted title. A successful exploit could allow the attacker to
inject a malicious link into the report, leading the user to believe that
the link is coming from the application.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
Bug ID(s): CSCvx28555
CVE ID: CVE-2021-1475
Security Impact Rating (SIR): Medium
CVSS Base Score: 4.1
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N
Workarounds
o There are no workarounds that address these vulnerabilities.
Fixed Software
o Cisco has addressed these vulnerabilities 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 vulnerabilities that are
described in this advisory.
Source
o Cisco would like to thank Abhinav Khanna of eSec Forte Technologies for
reporting these vulnerabilities
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-inject-gbZGHP5T
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-APR-07 |
+----------+---------------------------+----------+--------+--------------+
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