Corsaire Security Advisory: SAP Internet Graphics Server traversal issue

2005-07-25T00:00:00
ID SECURITYVULNS:DOC:9288
Type securityvulns
Reporter Securityvulns
Modified 2005-07-25T00:00:00

Description

-- Corsaire Security Advisory --

Title: SAP Internet Graphics Server traversal issue Date: 03.05.05 Application: SAP prior to version 6.40 Patch 11 Environment: Various Author: Martin O'Neal [martin.oneal@corsaire.com] Audience: General distribution Reference: c050503-001

-- Scope --

The aim of this document is to clearly define a vulnerability in the Internet Graphics Server application, as supplied by SAP. [1], that would allow unauthenticated access to files outside of the web root.

-- History --

Discovered: 03.05.05 (Martin O'Neal) Vendor notified: 11.05.05 Document released: 25.07.05

Interestingly, SAP have declined to share any information they have on this issue, even to the extent of refusing to allow Corsaire to see the official SAP advisory; stating that it is "SAP's policy to make it available to their customers only". It is always a pleasure to enter into a constructive dialog with industry professionals.

-- Overview --

The Internet Graphics Server (IGS) is a subcomponent of the SAP R/3 enterprise environment, which is accessible over HTTP via a minimalist web server component.

By entering an HTTP document path that incorporates a directory traversal (../..) sequence, documents outside of the web root can be accessed with the privileges of the user that was used to start the IGS service.

-- Analysis --

The IGS product does not appear to validate the document path that is passed to it, prior to using operating system functions to access and retrieve the documents.

-- Proof of Concept -

The exact path required to perform the traversal is dependent on the actual implementation of the product, and the directory to which it is installed. On the HP-UX platform, a working traversal path is:

http://host/htdocs/../../../../../../../../../../../../etc/passwd

-- Recommendations --

Upgrade to the latest version of the SAP IGS software, version 6.40 Patch 11.

Note: Corsaire has not had the opportunity to examine the patch, so can not vouch for whether it truly resolves the validation issues, or merely obscures them.

If the IGS component is not required, it can be deactivated using the process described in SAP Note 862169.

-- CVE --

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CAN-2005-1691 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardises names for security problems.

-- References --

[1] http://www.sap.com

-- Revision --

a. Initial release. b. Revised to include SAP patch information. c. Revised to include SAP patch version.

-- Distribution --

The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Corsaire accepts no responsibility for any damage caused by the use or misuse of this information.

-- Disclaimer --

The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Corsaire accepts no responsibility for any damage caused by the use or misuse of this information.

-- About Corsaire --

Corsaire are a leading information security consultancy, founded in 1997 in Guildford, Surrey, UK. Corsaire bring innovation, integrity and analytical rigour to every job, which means fast and dramatic security performance improvements. Our services centre on the delivery of information security planning, assessment, implementation, management and vulnerability research.

A free guide to selecting a security assessment supplier is available at http://www.penetration-testing.com

Copyright 2005 Corsaire Limited. All rights reserved.