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SAP CommonCryptoLib Null Pointer Dereference

SAP CommonCryptoLib Null Pointer Dereference
Posted Jan 27, 2022
Authored by Yvan Genuer | Site onapsis.com

SAP CommonCryptoLib suffers from a null pointer dereference vulnerability. An unauthenticated attacker without specific knowledge of the system can send a specially crafted packet over a network which will trigger an internal error causing the system to crash and remain unavailable.

tags | advisory
advisories | CVE-2021-38177
SHA-256 | 4e1a256c3f431f4168136d27f62d96f748180dc8bdcac0d78e7fd1c23eb39487

SAP CommonCryptoLib Null Pointer Dereference

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# Onapsis Security Advisory 2021-0025: Null Pointer Dereference
vulnerability in SAP CommonCryptoLib


## 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
causing the system to crash and remain unavailable.


## Advisory Information

- Public Release Date: 01/26/2022
- Security Advisory ID: ONAPSIS-2021-0025
- Researcher(s): Yvan Genuer


## Vulnerability Information

- Vendor: SAP
- Affected Components:
- All 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 7.77
- SAP KERNEL 7.81
- SAP KERNEL 7.83
- SAP KERNEL 7.84
- SAP KERNEL 7.85
- SAP KERNEL 8.04
- SAP HANA Database
- HDB 2.00
- SAP WebDispatcher
- WEBDISP 7.22EXT
- WEBDISP 7.49
- WEBDISP 7.53
- WEBDISP 7.77
- WEBDISP 7.81
- WEBDISP 7.85
- SAP XSA
- XS\_ADVANCED\_RUNTIME 1.00
- SAP Extended Application Service
- SAP\_EXTENDED\_APP\_SERVICES 1
- Content Server
- CONTSERV 6.50
- CONTSERV 7.53
- SAP SSO
- SAPSSOEXT 17
- SAP Crypto Library
- CRYPTOLIB 8
- SAP Host Agent
- SAPHOSTAGENT 7.22


(Check SAP Note 3051787 for detailed information on affected releases)

- Vulnerability Class: CWE-476
- CVSS v3 score: 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Risk Level: High
- Assigned CVE:
CVE-2021-38177
- Vendor patch Information: SAP Security NOTE 3051787


## Affected Components Description

The SAP Cryptographic Library manages digital signatures in SAP systems as
well
as provides several features related to encryption. For example, it acts as
the
security provider for SNC, TLS, SPNego or SSF.
This library is present in most SAP systems and its components, like SAP
Netweaver,
SAP HANA DB, Webdispatcher, Content Server, SAP Host Agent and more.


## Vulnerability Details

A memory corruption vulnerability exists for ```secssf_SsfVerifyEx()``` in
SAP
CommonCryptoLib. A null pointer dereference can be triggered by
unauthenticated
attacker by sending a specially crafted HTTP request with malicious cookie
data.
This causes the application to crash.


## Solution

SAP has released SAP Note 3051787 which provides patched versions of the
affected components.

The patches can be downloaded from
https://launchpad.support.sap.com/#/notes/3051787.

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

- 04/26/2021: Onapsis sends details to SAP
- 04/29/2021: SAP provides internal ID
- 05/10/2021: SAP update: Vulnerability being fixed
- 05/19/2021: SAP update: Due to patch process being complex, fix will be
delayed
- 07/12/2021: SAP update: Vulnerability fix in progress
- 08/09/2021: SAP update: Vulnerability fix in progress
- 09/14/2021: SAP releases SAP Note fixing the issue


## References

- Onapsis blogpost:
https://www.onapsis.com/blog/sap-security-patch-day-september-2021
- CVE Mitre:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38177
- Vendor Patch:
https://launchpad.support.sap.com/#/notes/3051787


## About Onapsis Research Labs

Onapsis Research Labs provides the industry analysis of key security
issues that impact business-critical systems and applications.
Delivering frequent and timely security and compliance advisories with
associated risk levels, Onapsis Research Labs combine in-depth knowledge
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


## About Onapsis, Inc.

Onapsis protects the mission-critical applications that run the global
economy,
from the core to the cloud. The Onapsis Platform uniquely delivers
actionable
insight, secure change, automated governance and continuous monitoring for
critical
systems—ERP, CRM, PLM, HCM, SCM and BI applications—from leading vendors
such as SAP,
Oracle, Salesforce and others, while keeping them protected and compliant.

For more information, connect with us on Twitter or LinkedIn, or visit us at
https://www.onapsis.com.


## License
This advisory is licensed under a [Creative Commons 4.0 BY-ND International
License](https://creativecommons.org/licenses/by-nd/4.0/legalcode)
<br><br><img src="../../images/license_cc.png" align="left" height="36"
width="112" >

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