ESB-2018.0396 - [Cisco] Cisco ASR 5000 Series Aggregation Services: Modify arbitrary files - Existing account - 2018-02-08


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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0396
        Cisco StarOS for Cisco ASR 5000 Series Aggregation Services
                   Routers File Overwrite Vulnerability
                              8 February 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco ASR 5000 Series Aggregation Services
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Modify Arbitrary Files -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0122  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180207-asr

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Cisco StarOS for Cisco ASR 5000 Series Aggregation Services Routers File
Overwrite Vulnerability

Medium

Advisory ID: cisco-sa-20180207-asr

First Published: 2018 February 7 16:00 GMT

Version 1.0: Final

Workarounds: No workarounds available

Cisco Bug IDs: CSCvf93335

CVSS Score: Base 4.4

CVE-2018-0122

CWE-20


Summary

A vulnerability in the CLI of the Cisco StarOS operating system for Cisco ASR
5000 Series Aggregation Services Routers could allow an authenticated, local
attacker to overwrite system files that are stored in the flash memory of an
affected system.

The vulnerability is due to insufficient validation of user-supplied input by
the affected operating system. An attacker could exploit this vulnerability by
injecting crafted command arguments into a vulnerable CLI command for the
affected operating system. A successful exploit could allow the attacker to
overwrite or modify arbitrary files that are stored in the flash memory of an
affected system. To exploit this vulnerability, the attacker would need to
authenticate to an affected system by using valid administrator credentials.

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-20180207-asr


Affected Products

Vulnerable Products This vulnerability affects Cisco ASR 5000 Series Aggregation
Services Routers that are running the Cisco StarOS operating system. For
information about affected releases, consult the Cisco bug ID(s) at the top of
this advisory.  Products Confirmed Not Vulnerable No other Cisco products are
currently known to be affected by this vulnerability.


Workarounds

There are no workarounds that address this vulnerability.


Fixed Software

For information about fixed 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

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.


URL

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180207-asr


Revision History

+---------+---------------------------+---------+--------+-------------------+
| Version |        Description        | Section | Status |       Date        |
+---------+---------------------------+---------+--------+-------------------+
| 1.0     | Initial public release.   | -       | Final  | 2018-February-07  |
+---------+---------------------------+---------+--------+-------------------+


Legal Disclaimer

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF
GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS
LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE
OR UPDATE THIS DOCUMENT AT ANY TIME.

A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information or
contain factual errors. The information in this document is intended for end
users of Cisco products.

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