Medium Severity
Affected system
Kernel
CVSS
5.4
Component
BC-CST-WDP
Patch Day
2021-07
Released on
2021/07/13
SAP Note
3000663
Workaround
Yes
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Advisory

On 13.07.2021 a security relevant correction has been released by SAP SE. The manufacturer resolves an issue within Kernel.

SAP Note 3000663 addresses "[CVE-2021-33683] HTTP Request Smuggling in SAP Web Dispatcher and Internet Communication Manager" to prevent http request smuggling with a medium risk for exploitation.

A workaround does exist, according to SAP Security Advisory team. It is advisable to implement the correction as part of maintenance, the team suggests.

Risk specification

The incorrect handling of the invalid Transfer-Encoding header leads to an HTTP Request Smuggling attack. This allows an attacker to bypass web application firewalls or other restrictions, leading to information disclosure.

Solution

SAP Web Dispatcher, ICM, and HANA Classic now properly handle invalid Transfer-Encoding headers  Circumstances exist that prevent the timely installation of a patch provided by the manufacturer. In such cases, you may consider applying the suggested workaround as a temporary or compensating mitigation: "Make sure that no component vulnerable to CVE-2019-16869 or CVE-2020-7238 is behind the SAP Web Dispatcher.".

 

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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.

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