SAP NetWeaver AS for ABAP 7.22 up to 8.04 Packet memmove denial of service

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CVSS Meta Temp Score
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CTI Interest Score
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7.5$0-$5k0.07

A vulnerability, which was classified as critical, has been found in SAP NetWeaver AS for ABAP 7.22 up to 8.04 (Solution Stack Software). Affected by this issue is the function memmove of the component Packet Handler. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. Impacted is availability. CVE summarizes:

SAP NetWeaver AS for ABAP (RFC Gateway), versions - KRNL32NUC - 7.22,7.22EXT, KRNL64NUC - 7.22,7.22EXT,7.49, KRNL64UC - 8.04,7.22,7.22EXT,7.49,7.53,7.73, KERNEL - 7.22,8.04,7.49,7.53,7.73,7.77,7.81,7.82,7.83, allows an unauthenticated attacker without specific knowledge of the system to send a specially crafted packet over a network which will trigger an internal error in the system due to improper input validation in method memmove() causing the system to crash and rendering it unavailable. In this attack, no data in the system can be viewed or modified.

The weakness was presented 06/09/2021. The advisory is available at wiki.scn.sap.com. This vulnerability is handled as CVE-2021-27597 since 02/23/2021. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 06/11/2021). This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.5

VulDB Base Score: 7.5
VulDB Temp Score: 7.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2infoedit

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfoedit

Class: Denial of service
CWE: CWE-404
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfoedit

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfoedit

02/23/2021 CVE assigned
06/09/2021 +105 days Advisory disclosed
06/09/2021 +0 days VulDB entry created
06/11/2021 +2 days VulDB last update

Sourcesinfoedit

Vendor: https://www.sap.com

Advisory: wiki.scn.sap.com
Status: Confirmed

CVE: CVE-2021-27597 (🔒)
scip Labs: https://www.scip.ch/en/?labs.20150716

Entryinfoedit

Created: 06/09/2021 08:48 PM
Updated: 06/11/2021 07:30 PM
Changes: (1) source_cve_cna
Complete: 🔍

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