CVE Vulnerabilities

CVE-2021-38164

Missing Authorization

Published: Sep 14, 2021 | Modified: Sep 24, 2021
CVSS 3.x
5.4
MEDIUM
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CVSS 2.x
5.5 MEDIUM
AV:N/AC:L/Au:S/C:P/I:P/A:N
RedHat/V2
RedHat/V3
Ubuntu

SAP ERP Financial Accounting (RFOPENPOSTING_FR) versions - SAP_APPL - 600, 602, 603, 604, 605, 606, 616, SAP_FIN - 617, 618, 700, 720, 730, SAPSCORE - 125, S4CORE, 100, 101, 102, 103, 104, 105, allows a registered attacker to invoke certain functions that would otherwise be restricted to specific users. These functions are normally exposed over the network and once exploited the attacker may be able to view and modify financial accounting data that only a specific user should have access to.

Weakness

The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Affected Software

Name Vendor Start Version End Version
Erp_financial_accounting Sap 100 (including) 100 (including)
Erp_financial_accounting Sap 101 (including) 101 (including)
Erp_financial_accounting Sap 102 (including) 102 (including)
Erp_financial_accounting Sap 103 (including) 103 (including)
Erp_financial_accounting Sap 104 (including) 104 (including)
Erp_financial_accounting Sap 105 (including) 105 (including)
Erp_financial_accounting Sap 602 (including) 602 (including)
Erp_financial_accounting Sap 603 (including) 603 (including)
Erp_financial_accounting Sap 604 (including) 604 (including)
Erp_financial_accounting Sap 605 (including) 605 (including)
Erp_financial_accounting Sap 606 (including) 606 (including)
Erp_financial_accounting Sap 616 (including) 616 (including)
Erp_financial_accounting Sap 618 (including) 618 (including)
Erp_financial_accounting Sap 700 (including) 700 (including)
Erp_financial_accounting Sap 720 (including) 720 (including)
Erp_financial_accounting Sap 730 (including) 730 (including)
Erp_financial_accounting Sap s4core (including) s4core (including)
Erp_financial_accounting Sap sap_appl_-_600 (including) sap_appl_-_600 (including)
Erp_financial_accounting Sap sap_fin_-_617 (including) sap_fin_-_617 (including)
Erp_financial_accounting Sap sapscore_-_125 (including) sapscore_-_125 (including)

Extended Description

Assuming a user with a given identity, authorization is the process of determining whether that user can access a given resource, based on the user’s privileges and any permissions or other access-control specifications that apply to the resource. When access control checks are not applied, users are able to access data or perform actions that they should not be allowed to perform. This can lead to a wide range of problems, including information exposures, denial of service, and arbitrary code execution.

Potential Mitigations

  • Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) [REF-229] to enforce the roles at the appropriate boundaries.
  • Note that this approach may not protect against horizontal authorization, i.e., it will not protect a user from attacking others with the same role.
  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
  • For example, consider using authorization frameworks such as the JAAS Authorization Framework [REF-233] and the OWASP ESAPI Access Control feature [REF-45].
  • For web applications, make sure that the access control mechanism is enforced correctly at the server side on every page. Users should not be able to access any unauthorized functionality or information by simply requesting direct access to that page.
  • One way to do this is to ensure that all pages containing sensitive information are not cached, and that all such pages restrict access to requests that are accompanied by an active and authenticated session token associated with a user who has the required permissions to access that page.

References