SAP NetWeaver and ABAP Platform: Incorrect Authorization
CVE-2022-27668 is a critical-severity incorrect authorization vulnerability in SAP NetWeaver and ABAP Platform from SAP, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected SAP NetWeaver and ABAP Platform versions: KERNEL 7.49; 7.77; 7.81, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 2.2% chance of exploitation within 30 days, higher than 83% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Check which version of SAP NetWeaver and ABAP Platform you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on launchpad.support.sap.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| SAP | SAP NetWeaver and ABAP Platform | KERNEL 7.49; 7.77; 7.81; 7.85; 7.86; 7.87; 7.88; KRNL64NUC 7.49; and 3 more ranges | Not stated |
| SAP | Netweaver As Abap | kernel_7.49; kernel_7.77; kernel_7.81; kernel_7.85; kernel_7.86; kernel_7.87; kernel_7.88 | Not stated |
| SAP | Netweaver As Abap Krnl64nuc | 7.49 | Not stated |
| SAP | Netweaver As Abap Krnl64uc | 7.49 | Not stated |
| SAP | Router | 7.22; 7.53 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 9.8 | Critical | NVD |
| CVSS 2.0 | 7.5 | High | NVD |
Official description
Depending on the configuration of the route permission table in file 'saprouttab', it is possible for an unauthenticated attacker to execute SAProuter administration commands in SAP NetWeaver and ABAP Platform - versions KERNEL 7.49, 7.77, 7.81, 7.85, 7.86, 7.87, 7.88, KRNL64NUC 7.49, KRNL64UC 7.49, SAP_ROUTER 7.53, 7.22, from a remote client, for example stopping the SAProuter, that could highly impact systems availability.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Incorrect Authorization
The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
How developers prevent this class of flaw
- 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) 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.
- Ensure that access control checks are performed related to the business logic. These checks may be different than the access control checks that are applied to more generic resources such as files, connections, processes, memory, and database records. For example, a database may restrict access for medical records to a specific database user, but each record might only be intended to be accessible to the patient and the patient's doctor.
- 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 and the OWASP ESAPI Access Control feature.
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Advisories
Technical write-ups (may include proof of concept)
- packetstormsecurity.com/files/168406/SAP-SAProuter-Improper-Access-Control.htmlExploit, Third Party Advisory
- seclists.org/fulldisclosure/2022/Sep/17Exploit, Mailing List, Third Party Advisory
Other vulnerabilities in SAP NetWeaver and ABAP Platform
- 7.5 High severity
- 8.9 High severity
- 9.9 Critical severity
- 9.8 Critical severity
- 10.0 Critical severity
Recent Incorrect Authorization vulnerabilities
- 7.5 High severity
- 7.1 High severity
- 9.8 Critical severity
- 7.5 High severity
- 7.5 High severity
- 8.8 High severity
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