Unauthorized modification in ITS-Services in IS-M, SAP security note 1684713

SAP security note 1684713, “Unauthorized modification in ITS-Services in IS-M”, is a note. Below are the symptom and SAP recommended solution.

Description

Symptom

IS-M can be abused by a malicious user, allowing them to modify displayed application content without authorization, and to potentially obtain authentication information from other legitimate users.

Solution

Please apply this note or import the changes via the relevant support package. The corrections of this note do only have a protecting effect if the corrections of notes 1621946 and 1488500 are implemented.

Reason and prerequisites

The following ITS Services within IS-M do not sufficiently encode OUTPUT parameters, resulting in a cross-site scripting issue:

• JGWWWIU1
• JGWWWIU2
• JHAW
• JHAW_ADMIN
• JHB4_IAC
• JHW3_IAC
• JKSDWWW01
• JKSDWWW02
• JKSDWWW03
• JKSDWWW04
• JKSDWWW10
• JKSDWWW11
• JKSDWWW15
• JKWWW01
• JKWWW02
• JKWWW03
• JKWWW04
• JKWWW05

Cross-site scripting can be used to steal another user’s authentication information, such as data relating to their current session. A malicious user 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.

References

• 1621946 – ITS: updated XSS-escaping functions
• 1488500 – ITS: automatically escape context fields in output