ID CVE-2015-6366
Summary Cisco IOS 15.2(04)M6 and 15.4(03)S lets physical-interface ACLs supersede tunnel-interface ACLs, which allows remote attackers to bypass intended network-traffic restrictions in opportunistic circumstances by using a tunnel, aka Bug ID CSCur01042.
References
Vulnerable Configurations
  • Cisco IOS 15.4(3)S
    cpe:2.3:o:cisco:ios:15.4%283%29s
  • cpe:2.3:o:cisco:ios:15.2%284%29m6
    cpe:2.3:o:cisco:ios:15.2%284%29m6
CVSS
Base: 5.0 (as of 13-11-2015 - 09:49)
Impact:
Exploitability:
CWE CWE-284
CAPEC
  • Embedding Scripts within Scripts
    An attack of this type exploits a programs' vulnerabilities that are brought on by allowing remote hosts to execute scripts. The attacker leverages this capability to execute scripts to execute his/her own script by embedding it within other scripts that the target software is likely to execute. The attacker must have the ability to inject script into script that is likely to be executed. If this is done, then the attacker can potentially launch a variety of probes and attacks against the web server's local environment, in many cases the so-called DMZ, back end resources the web server can communicate with, and other hosts. With the proliferation of intermediaries, such as Web App Firewalls, network devices, and even printers having JVMs and Web servers, there are many locales where an attacker can inject malicious scripts. Since this attack pattern defines scripts within scripts, there are likely privileges to execute said attack on the host. Of course, these attacks are not solely limited to the server side, client side scripts like Ajax and client side JavaScript can contain malicious scripts as well. In general all that is required is for there to be sufficient privileges to execute a script, but not protected against writing.
  • Signature Spoofing by Key Theft
    An attacker obtains an authoritative or reputable signer's private signature key by theft and then uses this key to forge signatures from the original signer to mislead a victim into performing actions that benefit the attacker.
Access
VectorComplexityAuthentication
NETWORK LOW NONE
Impact
ConfidentialityIntegrityAvailability
NONE PARTIAL NONE
nessus via4
NASL family CISCO
NASL id CISCO-SA-20151112-IOS2-IOS.NASL
description The remote Cisco device is affected by a security bypass vulnerability due to physical-interface ACLs superseding tunnel-interface ACLs. An authenticated, remote attacker connected to a tunnel interface can exploit this to bypass intended network-traffic restrictions.
last seen 2019-02-21
modified 2018-11-15
plugin id 86951
published 2015-11-19
reporter Tenable
source https://www.tenable.com/plugins/index.php?view=single&id=86951
title Cisco IOS Tunnel Interfaces Security Bypass
refmap via4
cisco 20151112 Cisco IOS Software Tunnel Interfaces Security Bypass Vulnerability
sectrack 1034141
Last major update 07-12-2016 - 13:19
Published 12-11-2015 - 22:59
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