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AUSCERT External Security Bulletin Redistribution
ESB-2019.3616
Cisco IOS XR Software for Cisco ASR 9000 VMAN CLI Privilege
Escalation Vulnerability
26 September 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IOS XR
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-12709
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190925-xr-asr9k-privesc
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco IOS XR Software for Cisco ASR 9000 VMAN CLI Privilege Escalation
Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20190925-xr-asr9k-privesc
First Published: 2019 September 25 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvo19278
CVE-2019-12709
CWE-78
CVSS Score:
6.7 AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in a CLI command related to the virtualization manager
(VMAN) in Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation
Services Routers could allow an authenticated, local attacker to execute
arbitrary commands on the underlying Linux operating system with root
privileges.
The vulnerability is due to insufficient validation of arguments passed to
a specific VMAN CLI command on an affected device. An attacker who has
valid administrator access to an affected device could exploit this
vulnerability by including malicious input as the argument of an affected
command. A successful exploit could allow the attacker to run arbitrary
commands on the underlying operating system with root privileges, which may
lead to complete system compromise.
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-20190925-xr-asr9k-privesc
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco ASR 9000
Series Aggregation Services Routers that were running Cisco IOS XR Software
releases 5.1.0 and later.
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.
Cisco has determined that this vulnerability does not affect Cisco IOS
Software, Cisco IOS XE Software, or Cisco NX-OS Software.
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 IOS XR Software releases 6.5.3 and 6.6.2
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 by Eugenio Iavarone of Cisco 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-20190925-xr-asr9k-privesc
Revision History
o +---------+------------------------+---------+--------+-------------------+
| Version | Description | Section | Status | Date |
+---------+------------------------+---------+--------+-------------------+
| 1.0 | Initial public | - | Final | 2019-September-25 |
| | release. | | | |
+---------+------------------------+---------+--------+-------------------+
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