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. This advisory will be posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20010627-ios-http-level.
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.
This advisory will be posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20010627-ios-http-level.
This section provides details on affected products.
Any device running Cisco IOS software release 11.3 and later is vulnerable.
Cisco devices that may be running with affected Cisco IOS software releases include but are not limited to:
For some products, the affected software releases are relatively new and may not be available on every device listed above.
If you are not running Cisco IOS software, you are not affected by this vulnerability.
Cisco products that do not run Cisco IOS software and are not affected by this defect include, but are not limited to:
No other Cisco products are currently known to be affected by these vulnerabilities.
By sending a crafted URL it is possible to bypass authentication and execute any command on the router at level 15 (enable level, the most privileged level). This will happen only if the user is using a local database for authentication (usernames and passwords are defined on the device itself). The same URL will not be effective against every Cisco IOS software release and hardware combination. However, there are only 84 different combinations to try, so it would be easy for an attacker to test them all in a short period of time.
The URL in question follows this format:
http:///level/xx/exec/....
Where xx is a number between 16 and 99.
This vulnerability is documented as Cisco Bug ID CSCdt93862.
The workaround for this vulnerability is to disable HTTP server on the router or to use TACACS+ or Radius for authentication.
To disable HTTP server, use the following commands:
Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# no ip http server
Note: This workaround is not applicable to customers running 12.2(2)T releases with IPv6 enabled because of CSCdt93862. In the 12.2(2)T release, HTTP is still accessible via IPv6 regardless of whether the HTTP server is disabled in the configuration. Customers running the 12.2(2)T release with IPv6 enabled must upgrade to 12.2(2.2)T or higher release (12.2.(2)T1 being the preferred release). IPv6 support is not enabled by default.
To configure TACACS+ or Radius for authentication, please consult the following link http://www.cisco.com/warp/public/480/tacplus.shtml.
Each row of the table describes a release train and the platforms or products for which it is intended. If a given release train is vulnerable, then the earliest possible releases that contain the fix and the anticipated date of availability for each are listed in the "Rebuild", "Interim", and "Maintenance" columns. A device running any release in the given train that is earlier than the release in a specific column (less than the earliest fixed release) is known to be vulnerable, and it should be upgraded at least to the indicated release or a later version (greater than the earliest fixed release label).
When selecting a release, keep in mind the following definitions:
In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco TAC for assistance as shown in the following section.
More information on Cisco IOS software release names and abbreviations is available at http://www.cisco.com/warp/public/620/1.html.
|
Train |
Description of Image or Platform |
Availability of Fixed Releases* |
||
|---|---|---|---|---|
|
11.0-based Releases and Earlier |
Rebuild |
Interim** |
Maintenance |
|
|
10.3 |
Multiple releases and platforms |
Not affected |
||
|
11.0 |
Multiple releases and platforms |
Not affected |
||
|
11.1-based Releases |
Rebuild |
Interim** |
Maintenance |
|
|
11.1 |
Major release for all platforms |
Not affected |
||
|
11.2-based Releases |
Rebuild |
Interim** |
Maintenance |
|
|
11.2 |
Major release for all platforms |
End of Engineering |
||
|
Not affected |
||||
|
11.3-based Releases |
Rebuild |
Interim** |
Maintenance |
|
|
11.3 |
Major release for all platforms |
End of Engineering |
||
|
Upgrade recommended to 12.0(18) |
||||
|
11.3AA |
ED for dial platforms and access servers: 5800, 5200, 5300, 7200 |
Not Scheduled |
||
|
Upgrade recommended to 12.1(9) |
||||
|
11.3DA |
Early deployment train for ISP DSLAM 6200 platform |
End of Engineering |
||
|
Upgrade recommended to 12.1(7)DA2 |
||||
|
11.3DB |
Early deployment train for ISP/Telco/PTT xDSL broadband concentrator platform, (NRP) for 6400 |
End of Engineering |
||
|
Upgrade recommended to 12.1(5)DB2 |
||||
|
11.3HA |
Short-lived ED release for ISR 3300 (SONET/SDH router) |
End of Engineering |
||
|
Upgrade recommended to 12.0(18) |
||||
|
11.3MA |
MC3810 functionality only |
End of Engineering |
||
|
Upgrade recommended to 12.1(9) |
||||
|
11.3NA |
Voice over IP, media convergence, various platforms |
End of Engineering |
||
|
Upgrade recommended to 12.1(9) |
||||
|
11.3T |
Early deployment major release, feature-rich for early adopters |
End of Engineering |
||
|
Upgrade recommended to 12.0(18) |
||||
|
11.3XA |
Introduction of ubr7246 and 2600 |
End of Engineering |
||
|
Upgrade recommended to 12.0(18) |
||||
|
11.3WA4 |
LightStream 1010 |
End of Engineering |
||
|
Upgrade recommended to 12.0W |
||||
|
12.0-based Releases |
Rebuild |
Interim** |
Maintenance |
|
|
12.0 |
General Deployment release for all platforms |
12.0(18) |
||
|
12.0DA |
xDSL support: 6100, 6200 |
Not Scheduled |
||
|
Upgrade recommended to 12.1(7)DA2 |
||||
|
12.0DB |
Early Deployment (ED) release, which delivers support for the Cisco 6400 Universal Access Concentrator (UAC) for Node Switch Processor (NSP). |
Not Scheduled |
||
|
Upgrade recommended to 12.1(5)DB2 |
||||
|
12.0DC |
Early Deployment (ED) release, which delivers support for the Cisco 6400 Universal Access Concentrator (UAC) for Node Switch Processor (NSP). |
Not Scheduled |
||
|
Upgrade recommended to 12.1DC |
||||
|
12.0S |
Core/ISP support: GSR, RSP, c7200 |
12.0(18)S Available 2001-July |
||
|
12.0SC |
Cable/broadband ISP: ubr7200 |
12.0(16)SC |
||
|
12.0SL |
10000 ESR: c10k |
Not affected |
||
|
12.0ST |
Cisco IOS software Release 12.OST is an early deployment (ED) release for the Cisco 7200, 7500/7000RSP and 12000 (GSR) series routers for Service Providers (ISPs). |
12.0(18)ST 2001-Jul-02 |
||
|
12.0T |
Early Deployment(ED): VPN, Distributed Director, various platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.1(9) |
||||
|
12.0(13)W5(19c) |
Catalyst switches: cat8510c, cat8540c, c6msm, ls1010, cat8510m, cat8540m |
Not vulnerable |
||
|
12.0(10)W5(18g) |
Catalyst switches: cat2948g, cat4232 |
12.0(18)W5(22a) 2001-August-23 |
||
|
12.0(14)W5(20) |
Catalyst switches: cat5000ATM |
12.0(18)W5(22) 2001-August-03 |
||
|
12.0WC |
12.0(5.4)WC1 2001-July |
|||
|
12.0WT |
cat4840g |
Not Scheduled |
||
|
Upgrade to be determined |
||||
|
12.0XA |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.1(9) |
||||
|
12.0XB |
Short-lived early deployment release |
Not Scheduled |
||
|
Upgrade recommended to 12.1(9) |
||||
|
12.0XC |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.1(9) |
||||
|
12.0XD |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.1(9) |
||||
|
12.0XE |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.1(8a)E |
||||
|
12.0XF |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.1(9) |
||||
|
12.0XG |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.1(9) |
||||
|
12.0XH |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.1(9) |
||||
|
12.0XI |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.1(9) |
||||
|
12.0XJ |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.1(9) |
||||
|
12.0(5)XK |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.1(9) |
||||
|
12.0(7)XK |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.1(9) |
||||
|
12.0XL |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.1(9) |
||||
|
12.0XM |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.0(4)XM1 Availability date to be determined |
||||
|
12.0XN |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.1(9) |
||||
|
12.0XP |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.0(5.4)WC1 |
||||
|
12.0XQ |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.1(9) |
||||
|
12.0XR |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.2(1b) |
||||
|
12.0XS |
Early Deployment (ED): limited platforms |
End of Engineering |
||
|
Upgrade recommended to 12.1(8a)E |
||||
|
12.0XU |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.0(5.4)WC1 |
||||
|
12.0XV |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.2(1b) 2001-Jul-02 |
||||
|
12.1-based Releases |
Rebuild |
Interim** |
Maintenance |
|
|
12.1 |
LD release for all platforms |
12.1(9) |
||
|
12.1AA |
Dial support |
12.1(9)AA |
||
|
12.1CX |
Core/ISP support: GSR, RSP, c7200 |
|||
|
12.1DA |
xDSL support: 6100, 6200 |
12.1(7)DA2 2001-Jun-18 |
||
|
12.1DB |
Cisco IOS Software Release 12.1(1)DB supports Cisco?s 6400 Universal Access Concentrator |
|||
|
12.1DC |
Cisco IOS Software Release 12.1(1)DC supports Cisco?s 6400 Universal Access Concentrator |
|||
|
12.1E |
Core/ISP support: GSR, RSP, c7200 |
12.1(8a)E 2001-Jul-09 |
||
|
12.1EC |
12.1EC is being offered to allow early support of new features on the uBR7200 platform, as well as future support for new Universal Broadband Router headend platforms. |
12.1(6.5)EC3 |
||
|
12.1EX |
Catalyst 6000 support |
12.1(8a)E 2001-Jul-09 |
||
|
12.1EY |
Cat8510c, Cat8510m, Cat8540c, Cat8540m, LS1010 |
12.1(6)EY |
||
|
12.1EZ |
Early Deployment (ED): special image |
12.1(6)EZ1 |
||
|
12.1T |
Early Deployment(ED): VPN, Distributed Director, various platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.2(1b) |
||||
|
12.1XA |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.2(1b) |
||||
|
12.1XB |
Early Deployment (ED): limited platforms |
|||
|
12.1XC |
Early Deployment (ED): limited platforms |
12.1(9)AA |
||
|
12.1XD |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.2(1b) |
||||
|
12.1XE |
Early Deployment (ED): limited platforms |
|||
|
12.1XF |
Early Deployment (ED): 811 and 813 (c800 images) |
12.1(2)XF4 2001-July-09 |
||
|
12.1XG |
Early Deployment (ED): 800, 805, 820, and 1600 |
12.1(5)XG5 2001-July-09 |
||
|
12.1XH |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.2(1b) |
||||
|
12.1XI |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.2(1b) |
||||
|
12.1XJ |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.1(5)YB4 |
||||
|
12.1XK |
Early Deployment (ED): limited platforms |
|||
|
12.1XL |
Early Deployment (ED): limited platforms |
Not Scheduled |
||
|
Upgrade recommended to 12.2(1b) |
||||
|
12.1XM |
Short-lived early deployment release |
12.1(4)XM4 2001-June-27 |
||
|
12.1XP |
Early Deployment (ED): 1700 and SOHO |
12.1(3)XP4 |
||
|
12.1XQ |
Short-lived early deployment release |
Not Scheduled |
||
|
Upgrade recommended to 12.2(1b) |
||||
|
12.1XR |
Short-lived early deployment release |
12.1(5)XR2 |
||
|
12.1XS |
Short-lived early deployment release |
12.1(5)XS2 2001-July |
||
|
12.1XT |
Early Deployment (ED): 1700 series |
12.1(3)XT3 |
||
|
12.1XU |
Early Deployment (ED): limited platforms |
12.1(5)XU1 |
||
|
12.1XV |
Short-lived early deployment release |
12.1(5)XV3 2001-July |
||
|
12.1XW |
Short-lived early deployment release |
Not Scheduled |
||
|
Upgrade recommended to 12.2DD |
||||
|
12.1XX |
Short-lived early deployment release |
12.1(6)EZ |
||
|
12.1XY |
Short-lived early deployment release |
12.1(5)XY6 2001-July |
||
|
12.1XZ |
Short-lived early deployment release |
12.1(5)XZ4 2001-July |
||
|
12.1YA |
Short-lived early deployment release |
Not Scheduled |
||
|
Upgrade recommended to 12.2(2)XB 2001-August |
||||
|
12.1YB |
Short-lived early deployment release |
12.1(5)YB4 |
||
|
12.1YC |
Short-lived early deployment release |
12.1(5)YC1 |
||
|
12.1YD |
Short-lived early deployment release |
12.1(5)YD2 2001-June-25 |
||
|
12.1YF |
Short-lived early deployment release |
12.1(5)YF2 |
||
|
12.2-based Releases |
Rebuild |
Interim** |
Maintenance |
|
|
12.2 |
LD release for all platforms |
12.2(1b)¹ 12.2(1c) |
12.2(1.1) |
12.2(3) 2001-August |
|
12.2T |
General deployment release for all platforms |
12.2(2.2)T |
||
|
12.2XA |
SPLOB |
12.2(2)XA 2001-July-02 |
||
|
12.2XD |
Short-lived early deployment release |
12.2(1)XD1 |
||
|
12.2XE |
Short-lived early deployment release |
12.2(1)XE |
||
|
12.2XH |
Short-lived early deployment release |
12.2(1)XH 2001-June-25 |
||
|
12.2XQ |
Short-lived early deployment release |
12.2(1)XQ 2001-June-23 |
||
|
Notes |
||||
|
* All dates are estimates and subject to change. ** Interim releases are subjected to less rigorous testing than regular maintenance releases, and may have serious bugs. ¹IOS releases 12.2(1a) and 12.2(1b) are deffered for the following platforms: ICS, 1750,2600,3600, vg200,5300,5800, 7200, 7500, 3810 |
||||
This vulnerability has been reported to us independently by David Hyams, Ernst & Young, Switzerland and by Bashis (bash@ns.wcd.se).
The Cisco PSIRT have learned that an automated exploit has been created. The scanning for and attempts of exploiting this vulnerability are increasing. All customers are strongly recommended to apply workarounds or to upgrade to the IOS version that is not affected.
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.
|
Revision 1.8 |
2003-Sep-23 |
Updated 2nd paragraph in Exploitation and Public Announcements section |
|
Revision 1.7 |
2001-Sep-13 |
Updated status from interim to final. |
|
Revision 1.6 |
2001-Sep-10 |
Updated workarounds section. |
|
Revision 1.5 |
2001-Aug-08 |
Updated Affected Products to include Catalyst 3500 XL |
|
Revision 1.4 |
2001-July-19 |
Revised Affected Products, IOS table, and Workarounds sections. |
|
Revision 1.3 |
2001-July-13 |
Updated workarounds section; deleted Catalyst 1900 and 2800 from the Affected Products section. |
|
Revision 1.2 |
2001-June-29 |
Updated platform descriptions |
|
Revision 1.1 |
2001-June-28 |
Updated software availability dates |
|
Revision 1.0 |
2001-June-27 |
Initial public release |
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 stand-alone 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.
Vulmon