var-202106-1808
Vulnerability from variot

SAP NetWeaver ABAP Server and ABAP Platform (Dispatcher), versions - KRNL32NUC - 7.22,7.22EXT, KRNL32UC - 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 DpRTmPrepareReq() causing the system to crash and rendering it unavailable. In this attack, no data in the system can be viewed or modified. SAP NetWeaver ABAP Server and ABAP Platform (Dispatcher) Is vulnerable to input validation.Denial of service (DoS) It may be put into a state.

Advisory Information

  • Public Release Date: 11/22/2021
  • Security Advisory ID: ONAPSIS-2021-0015
  • Researcher(s): Yvan Genuer

Vulnerability Information

  • Vendor: SAP
  • Affected Components: All SAP kernel 32 and 64 bits, unicode and no-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 Class: CWE-20, CWE-125, 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-2021-27628 CVE-2021-27607
  • Vendor patch Information: SAP Security NOTE 3021197

Affected Components Description

The SAP dispatcher service is part of SAP Kernel. Mandatory, it manage, gather and collect the requests from end users then forward them to work process.

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. 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 provide 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

  • Onapsis blogpost: https://www.onapsis.com/blog/sap-security-patch-day-june-2021-multiple-memory-corruption-vulnerabilities-can-lead-system
  • CVE Mitre: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27607 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27628
  • Vendor Patch: https://launchpad.support.sap.com/#/notes/3021197

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

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SAP NetWeaver ABAP Server and  ABAP Platform (Dispatcher) Is vulnerable to input validation.Denial of service  (DoS) It may be put into a state. \n\n\n## Advisory Information\n\n- Public Release Date: 11/22/2021\n- Security Advisory ID: ONAPSIS-2021-0015\n- Researcher(s): Yvan Genuer\n\n\n## Vulnerability Information\n\n- Vendor: SAP\n- Affected Components: All SAP kernel 32 and 64 bits, unicode and no-unicode\n  - SAP KERNEL 7.22\n  - SAP KERNEL 7.22EXT\n  - SAP KERNEL 7.49\n  - SAP KERNEL 7.53\n  - SAP KERNEL 7.73\n  - SAP KERNEL 7.77\n  - SAP KERNEL 7.81\n  - SAP KERNEL 8.04\n\n  (Check SAP Note 3021197 for detailed information on affected releases)\n\n- Vulnerability Class: CWE-20, CWE-125, CWE-476\n- CVSS v3 score: 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\n- Risk Level: High\n- Assigned CVE: CVE-2021-27628 CVE-2021-27607\n- Vendor patch Information: SAP Security NOTE 3021197\n\n\n## Affected Components Description\n\nThe SAP dispatcher service is part of SAP Kernel. Mandatory, it manage,\ngather\nand collect the requests from end users then forward them to work process. \n\n\n## Vulnerability Details\n\nCVE-2021-27607 : A NULL pointer dereference exist in `ThSncIn(REQUEST_BUF**,\nunsigned char)`, where `_Z10DpCaGetPtri` tries to read a part of input\ncontrolled by an attacker, then return 0x0 instead of a pointer to normal\nvalue\nif the input is 0xffffffff. If an attacker crafts a valid SAP Dispatcher packet,\nwith\nvalid header, but with a total packet size smaller than normal, the\nsubtraction\noperation results in a negative value. Also if this negative value is\nanticipated and put in the same packet at a particular offset, the check\noperation that compares the two values will pass, and this value is used as\nsize\nduring the next operation. \n\n\n## Solution\n\nSAP has released SAP Note 3021197 which provide patched versions of the\naffected components. \n\nThe patches can be downloaded from\nhttps://launchpad.support.sap.com/#/notes/3021197. \n\nOnapsis strongly recommends SAP customers to download the related\nsecurity fixes and apply them to the affected components in order to\nreduce business risks. \n\n\n## Report Timeline\n\n - 02/01/2021: Onapsis sends details to SAP\n - 02/04/2021: SAP provides internal ID\n - 02/08/2021: SAP confirms CVSS\n - 06/09/2021: SAP releases SAP Note fixing the issue. \n - 11/21/2021: Advisory published\n\n\n## References\n\n- Onapsis blogpost:\nhttps://www.onapsis.com/blog/sap-security-patch-day-june-2021-multiple-memory-corruption-vulnerabilities-can-lead-system\n- CVE Mitre:\nhttps://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27607\nhttps://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27628\n- Vendor Patch:\nhttps://launchpad.support.sap.com/#/notes/3021197\n\n\n## About Onapsis Research Labs\n\nOnapsis Research Labs provides the industry analysis of key security\nissues that impact business-critical systems and applications. \nDelivering frequent and timely security and compliance advisories with\nassociated risk levels, Onapsis Research Labs combine in-depth knowledge\nand experience to deliver technical and business-context with sound\nsecurity judgment to the broader information security community. \n\nFind all reported vulnerabilities at\nhttps://github.com/Onapsis/vulnerability_advisories\n\n\n## About Onapsis, Inc. \n\nOnapsis protects the mission-critical applications that run the global\neconomy,\nfrom the core to the cloud. The Onapsis Platform uniquely delivers\nactionable\ninsight, secure change, automated governance and continuous monitoring for\ncritical\nsystems\u2014ERP, CRM, PLM, HCM, SCM and BI applications\u2014from leading vendors\nsuch as SAP,\nOracle, Salesforce and others, while keeping them protected and compliant. \n\nFor more information, connect with us on Twitter or LinkedIn, or visit us at\nhttps://www.onapsis.com. \n\n## License\nThis advisory is licensed under a [Creative Commons 4.0 BY-ND International\nLicense](https://creativecommons.org/licenses/by-nd/4.0/legalcode)\n\u003cbr\u003e\u003cbr\u003e\u003cimg src=\"../../images/license_cc.png\" align=\"left\" height=\"36\"\nwidth=\"112\" \u003e\n\n-- \nThis email and any files transmitted with it are confidential and intended \nsolely for the use of the individual or entity to whom they are addressed. \nIf you have received this email in error please notify the system manager. \nThis message contains confidential information and is intended only for the \nindividual named. If you are not the named addressee you should not \ndisseminate, distribute or copy this e-mail. \nPlease notify the sender \nimmediately by e-mail if you have received this e-mail by mistake and \ndelete this e-mail from your system. If you are not the intended recipient \nyou are notified that disclosing, copying, distributing or taking any \naction in reliance on the contents of this information is strictly \nprohibited",
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