Security Advisories

The Onapsis Research Labs delivers regular SAP^® and Oracle^® vulnerability research to our ecosystem of customers, partners and the information security industry.

Onapsis security advisories enable customers to better understand the security and business implications of discovered SAP and Oracle security issues. This enables organizations to prioritize patches, updates and their remediation strategies to ensure continuity of the business. Onapsis security advisories, together with vendor patches and security notes, are available for download to provide vendors and end-users with the necessary information to mitigate advanced threats to mission-critical applications running on SAP and Oracle.

High 11/21/2021 SAP KERNEL

Memory Corruption Vulnerability in SAP NetWeaver

Impact On Business

An unauthenticated attacker without specific knowledge of the system can send a specially crafted packet over a network which will trigger an internal error in the system causing the system to crash and rendering it unavailable.

Affected Components Description

The SAP dispatcher service is part of SAP Kernel. Mandatory, it manages, gathers and collects the requests from end users then forward them to work process.Without SAP dispatcher service, the SAP system is not able to process any users requests.

Affected components:

SAP kernel 32 and 64 bits, unicode and non-unicode
SAP KERNEL 7.22
SAP KERNEL 7.22EXT
SAP KERNEL 7.49
SAP KERNEL 7.53
SAP KERNEL 7.73
SAP KERNEL 7.77
SAP KERNEL 7.81
SAP KERNEL 8.04

(Check SAP Note 3021197 for detailed information on affected releases)

Vulnerability Details

CVE-2021-27607 : A NULL pointer dereference exist in ThSncIn(REQUEST_BUF**, unsigned char), where _Z10DpCaGetPtri tries to read a part of input controlled by an attacker, then return 0x0 instead of a pointer to normal value if the input is 0xffffffff.

CVE-2021-27628 : A memory corruption vulnerability exists for DpRTmPrepareReq(DP_SESSION_INFO) in Disp+work binary through the SAP Dispatcher service. If an attacker crafts a valid SAP Dispatcher packet, with valid header, but with a total packet size smaller than normal, the subtraction operation results in a negative value. Also if this negative value is anticipated and put in the same packet at a particular offset, the check operation that compares the two values will pass, and this value is used as size during the next operation.

Solution

SAP has released SAP Note 3021197 which provides patched versions of the affected components.

The patches can be downloaded from https://launchpad.support.sap.com/#/notes/3021197.

Onapsis strongly recommends SAP customers to download the related security fixes and apply them to the affected components in order to reduce business risks.

Report Timeline

02/01/2021: Onapsis sends details to SAP
02/04/2021: SAP provides internal ID
02/08/2021: SAP confirms CVSS
06/09/2021: SAP releases SAP Note fixing the issue.
11/21/2021: Advisory published

REFERENCES

Advisory Information

Public Release Date: 11/21/2021
Security Advisory ID: ONAPSIS-2021-0015
Vulnerability Submission ID: 867, 861
Researcher(s): Yvan Genuer

Vulnerability Information

Vendor: SAP
Vulnerability Class: |LS|CWE-20|RS| Improper Input Validation, |LS|CWE-125|RS| Out-of-bounds Read, |LS|CWE-476|RS| NULL Pointer Dereference
CVSS v3 score: 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Severity: High
CVE: CVE-2021-27628, CVE-2021-27607
Vendor patch Information: SAP Security Note 3021197

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Onapsis Research Labs provides the industry analysis of key security issues that impact mission-critical systems and applications.

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and experience to deliver technical and business-context with sound security judgment to the broader information security community.

Find all reported vulnerabilities at https://github.com/Onapsis/vulnerability_advisories

This advisory is licensed under a Creative Commons 4.0 BY-ND International License