Advisory

SAP takes the security of its vast product portfolio very seriously and thus releases security fixes for vulnerabilities reported by external researchers and their customers every second Tuesday of the month.

SAP Note 3080567 was released on 14.09.2021 and deals with "[CVE-2021-38162] HTTP Request Smuggling in SAP Web Dispatcher" within Kernel. We advice you to follow the instructions, to resolve code injection denial of service (dos) information disclosure with a high potential for exploitation in component BC-CST-WDP.

According to SAP Security Advisory team a workaround exists. It is advisable to implement the correction as monthly patch process.

Risk specification

This note has been re-released with updated ‘Support Packages & Patches’ information. SAP Web Dispatcher allows an authenticated attacker to submit malicious request to a front-end server which leads after several attempts the back-end server confusing the boundaries of malicious and legitimate messages. This can result in the back-end server executing a malicious payload which can be used to read or modify any information on the server or making it temporarily unavailable.

Solution

The SAP Web Dispatcher has been fixed to prevent this code injection vulnerability. Alternativly, the consulting team has proposed the following: "As temporary workaround, block requests with malformed header (refer to Note for more details).". The suggestion may be considered, as a workaround or compensating mitigation. We recommend installing/applying the correction wherever possible and as soon as possible. Base your decision on whether or not to apply the patch on your companies and systems risk perspective and consider the provided CVSS 8.9 score.

The advisory is valid for

Disclaimer

SecurityBridge takes the security of SAP products very seriously. We very much encourage the responsible disclosure of security vulnerabilities. If you have detected a vulnerability concerning one of the SAP software products – either in the latest or in a former product version follow the guidelines and processes in accordance with the SAP portal page “Report a Security Vulnerability to SAP”.

The advisories found within the SecurityBridge advisory are generated and continuously enriched by our Team at SecurityBridge and affiliated security consultants, partners, customers of the SecurityBridge Platform, SAP support, and advisory groups.

We do not disclose zero-day vulnerabilities unless a security patch has been made available to the public. In such case, the platform only provides details on which version or signature updates are available within the SecurityBridge platform in order to monitor or measure the vulnerability.

In accordance with SAP guidelines, SecurityBridge only discloses issues where the fixing security note has been released. The vulnerability platform makes no references to available exploits or Proof of Concepts (PoC). Advisories and vulnerabilities will always mention the fixing security note or hints to the corresponding SAP documentation.

SecurityBridge^{for SAP©}
empowers security teams with forward-looking, high fidelity, adversary-focused intelligence and actionable events from SAP Netweaver based systems.

Follow @_securitybridge

Notifications

Affected system Kernel

CVSS 8.9

Component BC-CST-WDP

Patch Day2021-09

Released on2021/09/14

SAP Note 3080567

Workaround Yes

Advisory

Risk specification

Solution

Disclaimer

_{Affected system}
Kernel

_CVSS
8.9

_Component
BC-CST-WDP

_{Patch Day}
2021-09

_{Released
on}
2021/09/14

_{SAP Note}
3080567

_Workaround
Yes