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AUSCERT External Security Bulletin Redistribution
ESB-2015.2829
Cisco IOS Software Virtual PPP Interfaces Security Bypass Vulnerability
16 November 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IOS Software
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2015-6365
Original Bulletin:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151112-ios1
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Cisco IOS Software Virtual PPP Interfaces Security Bypass Vulnerability
Medium
Advisory ID: cisco-sa-20151112-ios1
Published: 2015 November 13 11:30 GMT
Version 1.0: Final
CVSS Score: Base - 4.0
Workarounds: No workarounds available
Cisco Bug IDs: CSCur61303 CVE-2015-6365 CWE-20
Summary
A vulnerability in Cisco devices that are running Cisco IOS Software Release
15.2(04)M or Cisco IOS Software Release 15.4(03)M and are configured to use
access control lists (ACLs) could allow a user who is connected to an
authenticated PPP session to bypass ACLs that are configured on virtual PPP
interfaces, if the ACL on the physical interface permits the traffic to pass.
The vulnerability is due to the physical interface ignoring virtual PPP ACLs.
An attacker could exploit this vulnerability to bypass virtual PPP ACLs and
pass denied traffic across virtual PPP interfaces. A successful exploit could
allow the attacker to pass traffic as if the ACLs do not exist.
Cisco has released software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are not available.
This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151112-ios1
Affected Products
Vulnerable Products
Cisco IOS Software Release 15.2(04)M and Cisco IOS Software Release 15.4(03)M.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Indicators of Compromise
A device may indicate compromise if the ACLs on the virtual PPP interfaces do
not appear to deny traffic that is permitted to pass on the physical
interfaces.
Workarounds
There are no workarounds that mitigate this vulnerability.
Fixed Software
When considering software upgrades, customers are advised to consult the Cisco
Security Advisories and Responses archive at http://www.cisco.com/go/psirt and
review subsequent advisories to determine exposure and a complete upgrade
solution.
In all cases, customers should ensure that the devices to upgrade 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
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151112-ios1
Revision History
Version Description Section Status Date
1.0 Initial public release. Final 2015-November-13
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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