Unauthorized modification of displayed content in Logon App, SAP security note 1809965

SAP security note 1809965, “Unauthorized modification of displayed content in Logon App”, is a note released on August 13, 2013. Below are the symptom, SAP recommended solution and the affected software components.

Description

Symptom

SAP Logon Application can be abused by an attacker, allowing them to modify displayed application content without authorization, and to potentially obtain authentication information from other legitimate users.

Solution

The issue is reproducible with Internet Explorer; using Firefox prevents the issue.

To apply the fix, you need to deploy the necessary components according to the Validity and Support Package Patch Level sections of this note.

For specific support package patches, please refer to the Support Package Patches section of the note.

Reason and prerequisites

The logon page within Logon Application does not sufficiently encode OUTPUT parameters, resulting in a reflected cross-site scripting issue. A reflected cross-site scripting attack can be used to non-permanently deface or modify displayed content from a website.

Reflected cross-site scripting can be used to steal another user’s authentication information, such as data relating to their current session. An attacker who gains access to this data may use it to impersonate the user and access all information with the same rights as the target user. If an administrator is impersonated, the security of the application may be fully compromised.

CVSS

Score 4.3 Vector: AV:N/AC:M/AU:N/C:N/I:P/A:N

Affected components

• J2EE-APPS 7.10 – 7.11
• J2EE-APPS 7.20
• J2EE-APPS 7.30
• J2EE-APPS 7.31
• J2EE-APPS 7.40