ID CVE-2001-0537
Summary HTTP server for Cisco IOS 11.3 to 12.2 allows attackers to bypass authentication and execute arbitrary commands, when local authorization is being used, by specifying a high access level in the URL.
References
Vulnerable Configurations
  • Cisco IOS 11.3
    cpe:2.3:o:cisco:ios:11.3
  • Cisco IOS 11.3AA
    cpe:2.3:o:cisco:ios:11.3aa
  • Cisco IOS 11.3 DA
    cpe:2.3:o:cisco:ios:11.3da
  • Cisco IOS 11.3DB
    cpe:2.3:o:cisco:ios:11.3db
  • Cisco IOS 11.3 HA
    cpe:2.3:o:cisco:ios:11.3ha
  • Cisco IOS 11.3 MA
    cpe:2.3:o:cisco:ios:11.3ma
  • Cisco IOS 11.3 NA
    cpe:2.3:o:cisco:ios:11.3na
  • Cisco IOS 11.3T
    cpe:2.3:o:cisco:ios:11.3t
  • Cisco IOS 11.3 XA
    cpe:2.3:o:cisco:ios:11.3xa
  • Cisco IOS 12.0
    cpe:2.3:o:cisco:ios:12.0
  • Cisco IOS 12.0 (5)XK
    cpe:2.3:o:cisco:ios:12.0%285%29xk
  • Cisco IOS 12.0 (7)XK
    cpe:2.3:o:cisco:ios:12.0%287%29xk
  • Cisco IOS 12.0 (10)W5(18g)
    cpe:2.3:o:cisco:ios:12.0%2810%29w5%2818g%29
  • Cisco IOS 12.0 (14)W5(20)
    cpe:2.3:o:cisco:ios:12.0%2814%29w5%2820%29
  • Cisco IOS 12.0DA
    cpe:2.3:o:cisco:ios:12.0da
  • Cisco IOS 12.0DB
    cpe:2.3:o:cisco:ios:12.0db
  • Cisco IOS 12.0DC
    cpe:2.3:o:cisco:ios:12.0dc
  • Cisco IOS 12.0S
    cpe:2.3:o:cisco:ios:12.0s
  • Cisco IOS 12.0SC
    cpe:2.3:o:cisco:ios:12.0sc
  • Cisco IOS 12.0SL
    cpe:2.3:o:cisco:ios:12.0sl
  • Cisco IOS 12.0ST
    cpe:2.3:o:cisco:ios:12.0st
  • Cisco IOS 12.0T
    cpe:2.3:o:cisco:ios:12.0t
  • Cisco IOS 12.0WC
    cpe:2.3:o:cisco:ios:12.0wc
  • Cisco IOS 12.0WT
    cpe:2.3:o:cisco:ios:12.0wt
  • Cisco IOS 12.0XA
    cpe:2.3:o:cisco:ios:12.0xa
  • Cisco IOS 12.0XB
    cpe:2.3:o:cisco:ios:12.0xb
  • Cisco IOS 12.0XC
    cpe:2.3:o:cisco:ios:12.0xc
  • Cisco IOS 12.0XD
    cpe:2.3:o:cisco:ios:12.0xd
  • Cisco IOS 12.0XE
    cpe:2.3:o:cisco:ios:12.0xe
  • Cisco IOS 12.0XF
    cpe:2.3:o:cisco:ios:12.0xf
  • Cisco IOS 12.0XG
    cpe:2.3:o:cisco:ios:12.0xg
  • Cisco IOS 12.0XH
    cpe:2.3:o:cisco:ios:12.0xh
  • Cisco IOS 12.0XI
    cpe:2.3:o:cisco:ios:12.0xi
  • Cisco IOS 12.0XJ
    cpe:2.3:o:cisco:ios:12.0xj
  • Cisco IOS 12.0XL
    cpe:2.3:o:cisco:ios:12.0xl
  • Cisco IOS 12.0XM
    cpe:2.3:o:cisco:ios:12.0xm
  • Cisco IOS 12.0XN
    cpe:2.3:o:cisco:ios:12.0xn
  • Cisco IOS 12.0XP
    cpe:2.3:o:cisco:ios:12.0xp
  • Cisco IOS 12.0XQ
    cpe:2.3:o:cisco:ios:12.0xq
  • Cisco IOS 12.0XR
    cpe:2.3:o:cisco:ios:12.0xr
  • Cisco IOS 12.0XS
    cpe:2.3:o:cisco:ios:12.0xs
  • Cisco IOS 12.0XU
    cpe:2.3:o:cisco:ios:12.0xu
  • Cisco IOS 12.0Xv
    cpe:2.3:o:cisco:ios:12.0xv
  • Cisco IOS 12.1
    cpe:2.3:o:cisco:ios:12.1
  • Cisco IOS 12.1AA
    cpe:2.3:o:cisco:ios:12.1aa
  • Cisco IOS 12.1CX
    cpe:2.3:o:cisco:ios:12.1cx
  • Cisco IOS 12.1DA
    cpe:2.3:o:cisco:ios:12.1da
  • Cisco IOS 12.1DB
    cpe:2.3:o:cisco:ios:12.1db
  • Cisco IOS 12.1DC
    cpe:2.3:o:cisco:ios:12.1dc
  • Cisco IOS 12.1E
    cpe:2.3:o:cisco:ios:12.1e
  • Cisco IOS 12.1EC
    cpe:2.3:o:cisco:ios:12.1ec
  • Cisco IOS 12.1EX
    cpe:2.3:o:cisco:ios:12.1ex
  • Cisco IOS 12.1EY
    cpe:2.3:o:cisco:ios:12.1ey
  • Cisco IOS 12.1EZ
    cpe:2.3:o:cisco:ios:12.1ez
  • Cisco IOS 12.1T
    cpe:2.3:o:cisco:ios:12.1t
  • Cisco IOS 12.1XA
    cpe:2.3:o:cisco:ios:12.1xa
  • Cisco IOS 12.1XB
    cpe:2.3:o:cisco:ios:12.1xb
  • Cisco IOS 12.1XC
    cpe:2.3:o:cisco:ios:12.1xc
  • Cisco IOS 12.1XD
    cpe:2.3:o:cisco:ios:12.1xd
  • Cisco IOS 12.1XE
    cpe:2.3:o:cisco:ios:12.1xe
  • Cisco IOS 12.1XF
    cpe:2.3:o:cisco:ios:12.1xf
  • Cisco IOS 12.1XG
    cpe:2.3:o:cisco:ios:12.1xg
  • Cisco IOS 12.1XH
    cpe:2.3:o:cisco:ios:12.1xh
  • Cisco IOS 12.1XI
    cpe:2.3:o:cisco:ios:12.1xi
  • Cisco IOS 12.1XJ
    cpe:2.3:o:cisco:ios:12.1xj
  • Cisco IOS 12.1XK
    cpe:2.3:o:cisco:ios:12.1xk
  • Cisco IOS 12.1XL
    cpe:2.3:o:cisco:ios:12.1xl
  • Cisco IOS 12.1XM
    cpe:2.3:o:cisco:ios:12.1xm
  • Cisco IOS 12.1XP
    cpe:2.3:o:cisco:ios:12.1xp
  • Cisco IOS 12.1XQ
    cpe:2.3:o:cisco:ios:12.1xq
  • Cisco IOS 12.1XR
    cpe:2.3:o:cisco:ios:12.1xr
  • Cisco IOS 12.1XS
    cpe:2.3:o:cisco:ios:12.1xs
  • Cisco IOS 12.1XT
    cpe:2.3:o:cisco:ios:12.1xt
  • Cisco IOS 12.1XU
    cpe:2.3:o:cisco:ios:12.1xu
  • Cisco IOS 12.1XV
    cpe:2.3:o:cisco:ios:12.1xv
  • Cisco IOS 12.1XW
    cpe:2.3:o:cisco:ios:12.1xw
  • Cisco IOS 12.1XX
    cpe:2.3:o:cisco:ios:12.1xx
  • Cisco IOS 12.1XY
    cpe:2.3:o:cisco:ios:12.1xy
  • Cisco IOS 12.1XZ
    cpe:2.3:o:cisco:ios:12.1xz
  • Cisco IOS 12.1YA
    cpe:2.3:o:cisco:ios:12.1ya
  • Cisco IOS 12.1YB
    cpe:2.3:o:cisco:ios:12.1yb
  • Cisco IOS 12.1YC
    cpe:2.3:o:cisco:ios:12.1yc
  • Cisco IOS 12.1YD
    cpe:2.3:o:cisco:ios:12.1yd
  • Cisco IOS 12.1YF
    cpe:2.3:o:cisco:ios:12.1yf
  • Cisco IOS 12.2
    cpe:2.3:o:cisco:ios:12.2
  • Cisco IOS 12.2T
    cpe:2.3:o:cisco:ios:12.2t
  • Cisco IOS 12.2XA
    cpe:2.3:o:cisco:ios:12.2xa
  • Cisco IOS 12.2XD
    cpe:2.3:o:cisco:ios:12.2xd
  • Cisco IOS 12.2XE
    cpe:2.3:o:cisco:ios:12.2xe
  • Cisco IOS 12.2XH
    cpe:2.3:o:cisco:ios:12.2xh
  • Cisco IOS 12.2XQ
    cpe:2.3:o:cisco:ios:12.2xq
CVSS
Base: 9.3 (as of 01-01-2004 - 00:00)
Impact:
Exploitability:
CWE CWE-287
CAPEC
  • Authentication Abuse
    An attacker obtains unauthorized access to an application, service or device either through knowledge of the inherent weaknesses of an authentication mechanism, or by exploiting a flaw in the authentication scheme's implementation. In such an attack an authentication mechanism is functioning but a carefully controlled sequence of events causes the mechanism to grant access to the attacker. This attack may exploit assumptions made by the target's authentication procedures, such as assumptions regarding trust relationships or assumptions regarding the generation of secret values. This attack differs from Authentication Bypass attacks in that Authentication Abuse allows the attacker to be certified as a valid user through illegitimate means, while Authentication Bypass allows the user to access protected material without ever being certified as an authenticated user. This attack does not rely on prior sessions established by successfully authenticating users, as relied upon for the "Exploitation of Session Variables, Resource IDs and other Trusted Credentials" attack patterns.
  • Exploiting Trust in Client (aka Make the Client Invisible)
    An attack of this type exploits a programs' vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by placing themselves in the communication channel between client and server such that communication directly to the server is possible where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.
  • Utilizing REST's Trust in the System Resource to Register Man in the Middle
    This attack utilizes a REST(REpresentational State Transfer)-style applications' trust in the system resources and environment to place man in the middle once SSL is terminated. Rest applications premise is that they leverage existing infrastructure to deliver web services functionality. An example of this is a Rest application that uses HTTP Get methods and receives a HTTP response with an XML document. These Rest style web services are deployed on existing infrastructure such as Apache and IIS web servers with no SOAP stack required. Unfortunately from a security standpoint, there frequently is no interoperable identity security mechanism deployed, so Rest developers often fall back to SSL to deliver security. In large data centers, SSL is typically terminated at the edge of the network - at the firewall, load balancer, or router. Once the SSL is terminated the HTTP request is in the clear (unless developers have hashed or encrypted the values, but this is rare). The attacker can utilize a sniffer such as Wireshark to snapshot the credentials, such as username and password that are passed in the clear once SSL is terminated. Once the attacker gathers these credentials, they can submit requests to the web service provider just as authorized user do. There is not typically an authentication on the client side, beyond what is passed in the request itself so once this is compromised, then this is generally sufficient to compromise the service's authentication scheme.
  • Man in the Middle Attack
    This type of attack targets the communication between two components (typically client and server). The attacker places himself in the communication channel between the two components. Whenever one component attempts to communicate with the other (data flow, authentication challenges, etc.), the data first goes to the attacker, who has the opportunity to observe or alter it, and it is then passed on to the other component as if it was never intercepted. This interposition is transparent leaving the two compromised components unaware of the potential corruption or leakage of their communications. The potential for Man-in-the-Middle attacks yields an implicit lack of trust in communication or identify between two components.
Access
VectorComplexityAuthentication
NETWORK MEDIUM NONE
Impact
ConfidentialityIntegrityAvailability
COMPLETE COMPLETE COMPLETE
exploit-db via4
  • description Cisco IOS 11.x/12.x HTTP Configuration Arbitrary Administrative Access Vulnerability (1). CVE-2001-0537 . Remote exploit for hardware platform
    id EDB-ID:20975
    last seen 2016-02-02
    modified 2001-06-27
    published 2001-06-27
    reporter cronos
    source https://www.exploit-db.com/download/20975/
    title Cisco IOS 11.x/12.x HTTP Configuration Arbitrary Administrative Access Vulnerability 1
  • description Cisco IOS 11.x/12.x HTTP Configuration Arbitrary Administrative Access Vulnerability (4). CVE-2001-0537 . Remote exploit for hardware platform
    id EDB-ID:20978
    last seen 2016-02-02
    modified 2001-06-27
    published 2001-06-27
    reporter blackangels
    source https://www.exploit-db.com/download/20978/
    title Cisco IOS 11.x/12.x HTTP Configuration Arbitrary Administrative Access Vulnerability 4
  • description Cisco IOS 11.x/12.x HTTP Configuration Arbitrary Administrative Access Vulnerability (2). CVE-2001-0537 . Remote exploit for hardware platform
    id EDB-ID:20976
    last seen 2016-02-02
    modified 2001-06-27
    published 2001-06-27
    reporter Eliel C. Sardanons
    source https://www.exploit-db.com/download/20976/
    title Cisco IOS 11.x/12.x HTTP Configuration Arbitrary Administrative Access Vulnerability 2
  • description Cisco IOS 11.x/12.x HTTP Configuration Arbitrary Administrative Access Vulnerability (3). CVE-2001-0537 . Remote exploit for hardware platform
    id EDB-ID:20977
    last seen 2016-02-02
    modified 2001-03-07
    published 2001-03-07
    reporter hypoclear
    source https://www.exploit-db.com/download/20977/
    title Cisco IOS 11.x/12.x HTTP Configuration Arbitrary Administrative Access Vulnerability 3
metasploit via4
description This module exploits a vulnerability in the Cisco IOS HTTP Server. By sending a GET request for "/level/num/exec/..", where num is between 16 and 99, it is possible to bypass authentication and obtain full system control. IOS 11.3 -> 12.2 are reportedly vulnerable. This module tested successfully against a Cisco 1600 Router IOS v11.3(11d).
id MSF:AUXILIARY/SCANNER/HTTP/CISCO_IOS_AUTH_BYPASS
last seen 2018-09-24
modified 2017-11-08
published 2010-12-10
reliability Normal
reporter Rapid7
source https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/http/cisco_ios_auth_bypass.rb
title Cisco IOS HTTP Unauthorized Administrative Access
nessus via4
  • NASL family CISCO
    NASL id CISCO-SA-20010627-IOS-HTTP-LEVELHTTP.NASL
    description When the HTTP server is enabled and local authorization is used, it is possible, under some circumstances, to bypass the authentication and execute any command on the device. In that case, the user will be able to exercise complete control over the device. All commands will be executed with the highest privilege (level 15). All releases of Cisco IOS software, starting with release 11.3 and later, are vulnerable. Virtually all mainstream Cisco routers and switches running Cisco IOS software are affected by this vulnerability. Products that are not running Cisco IOS software are not vulnerable. The workaround for this vulnerability is to disable HTTP server on the router or to use Terminal Access Controller Access Control System (TACACS+) or Radius for authentication.
    last seen 2019-02-21
    modified 2018-11-15
    plugin id 48956
    published 2010-09-01
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=48956
    title IOS HTTP Authorization Vulnerability - Cisco Systems
  • NASL family CISCO
    NASL id CISCO_HTTP_ADMIN_ACCESS.NASL
    description It is possible to execute arbitrary commands on the remote Cisco router. An attacker may leverage this issue to disable network access via this device or lock legitimate users out of the router.
    last seen 2019-02-21
    modified 2018-11-15
    plugin id 10700
    published 2001-07-02
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=10700
    title Cisco IOS HTTP Configuration Unauthorized Administrative Access
refmap via4
bid 2936
bugtraq
  • 20010629 Re: Cisco Security Advisory: IOS HTTP authorization vulnerability
  • 20010702 Cisco IOS HTTP Configuration Exploit
  • 20010702 Cisco device HTTP exploit...
  • 20010702 ios-http-auth.sh
cert CA-2001-14
ciac L-106
cisco 20010627 IOS HTTP authorization vulnerability
osvdb 578
xf cisco-ios-admin-access(6749)
saint via4
bid 2936
description Cisco IOS HTTP access level authentication bypass
id net_cisco_webbypass
osvdb 578
title cisco_ios_http_level
type remote
Last major update 05-09-2008 - 00:00
Published 21-07-2001 - 00:00
Last modified 09-10-2017 - 21:29
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