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AUSCERT External Security Bulletin Redistribution
ESB-2021.0137
Cisco StarOS for Cisco ASR 5000 Series Routers Arbitrary
File Read Vulnerability
14 January 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco ASR 5000 Series Software
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1145
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-staros-file-read-L3RDvtey
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco StarOS for Cisco ASR 5000 Series Routers Arbitrary File Read
Vulnerability
Priority: Medium
Advisory ID: cisco-sa-staros-file-read-L3RDvtey
First Published: 2021 January 13 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvv34230
CVE Names: CVE-2021-1145
CWEs: CWE-61
Summary
o A vulnerability in the Secure FTP (SFTP) of Cisco StarOS for Cisco ASR 5000
Series Routers could allow an authenticated, remote attacker to read
arbitrary files on an affected device. To exploit this vulnerability, the
attacker would need to have valid credentials on the affected device.
The vulnerability is due to insecure handling of symbolic links. An
attacker could exploit this vulnerability by sending a crafted SFTP command
to an affected device. A successful exploit could allow the attacker to
read arbitrary files on the affected device.
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-staros-file-read-L3RDvtey
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco ASR 5000
Series Routers if they were running a release of Cisco StarOS earlier than
Release 21.19.7.
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 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 StarOS releases 21.19.7 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 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-staros-file-read-L3RDvtey
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-JAN-13 |
+----------+---------------------------+----------+--------+--------------+
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