Advisory

On 09.01.2024 a security relevant correction has been released by SAP SE. The manufacturer resolves an issue within Kernel.

SAP Note 3389917 addresses "[CVE-2023-44487] Denial of service (DOS) in SAP Web Dispatcher, SAP NetWeaver Application server ABAP, and ABAP Platform" to prevent denial of service (dos) with a high 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.

Denial of Service (DoS) attacks that take a system offline may lead to significant cost for the company, studies quantify the costs in average between 4 and 5 millions dollars. Business continuity requires SAP systems staying online. The CVSS scores or vulnerability descriptions are not enough to represent how a simple bug can lead to a significant loss for companies.

Risk specification

SAP Web Dispatcher, SAP NetWeaver Application Server ABAP, and ABAP Platform allow an unauthenticated attacker to send massive number of requests resulting in an Denial of service attack.

Solution

The requests are now properly handled by SAP application server (SAP Kernel) and SAP Web Dispatcher. 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: "The Denial of service (DOS) vulnerability is mitigated by rate limiting. If a massive number of HTTP requests is canceled on an HTTP/2 connection, the HTTP/2 connection will be aborted.".

The advisory is valid for

KRNL64UC 7.53 ³⁶
WEBDISP 7.53 ¹⁵
WEBDISP 7.77 ¹⁴
WEBDISP 7.85 ¹¹
WEBDISP 7.89 ⁷
WEBDISP 7.54 ⁷
WEBDISP 7.93 ³
WEBDISP 7.94
WEBDISP 7.95
KERNEL 7.53 ³⁶
KERNEL 7.77 ³⁴
KERNEL 7.85 ²⁵
KERNEL 7.89 ¹⁶
KERNEL 7.54 ¹⁵
KERNEL 7.93 ¹⁰
KERNEL 7.94 ³
KERNEL 7.95

Releated advisories

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.

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Notifications

Affected system Kernel

CVSS 7.5

Component BC-CST-IC

Patch Day2024-01

Released on2024/01/09

SAP Note 3389917

Workaround Yes

Advisory

Risk specification

Solution

Disclaimer

_{Affected system}
Kernel

_CVSS
7.5

_Component
BC-CST-IC

_{Patch Day}
2024-01

_{Released
on}
2024/01/09

_{SAP Note}
3389917

_Workaround
Yes