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AUSCERT External Security Bulletin Redistribution
ESB-2020.2117
Cisco ASR 5000 Series Aggregation Services Routers Enhanced
Charging Service Rule Bypass Vulnerability
18 June 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco ASR 5000 Series Aggregation Services Routers
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3244
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asr5k-ecs-bypass-2LqfPCL
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Cisco ASR 5000 Series Aggregation Services Routers Enhanced Charging Service
Rule Bypass Vulnerability
Priority: Medium
Advisory ID: cisco-sa-asr5k-ecs-bypass-2LqfPCL
First Published: 2020 June 17 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvs83392
CVE-2020-3244
CWE-20
CVSS Score:
5.3 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:X/RL:X/RC:X
Summary
o A vulnerability in the Enhanced Charging Service (ECS) functionality of
Cisco ASR 5000 Series Aggregation Services Routers could allow an
unauthenticated, remote attacker to bypass the traffic classification rules
on an affected device.
The vulnerability is due to insufficient input validation of user traffic
going through an affected device. An attacker could exploit this
vulnerability by sending a malformed HTTP request to an affected device. A
successful exploit could allow the attacker to bypass the traffic
classification rules and potentially avoid being charged for traffic
consumption.
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-asr5k-ecs-bypass-2LqfPCL
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco ASR 5000
Series Aggregation Services Routers if they were running a software release
earlier than Release 21.18.0 and had an ECS rule configured to match on the
CONNECT HTTP method.
Note: To determine whether an ECS rule is configured to match on the
CONNECT HTTP method, administrators can use the show active-charging
ruledef all command and search for http request method = connect in the
results.
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
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 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.
Fixed Releases
At the time of publication, Cisco ASR 5000 Aggregation Services Routers
software releases 21.18.0 and later contained the fix for this
vulnerability.
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
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 the resolution of a Cisco TAC support
case.
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-asr5k-ecs-bypass-2LqfPCL
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-JUN-17 |
+----------+---------------------------+----------+--------+--------------+
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