SAP Multiple Products HTTP Request Smuggling
CVE-2022-22536 is a critical-severity inconsistent interpretation of HTTP requests vulnerability in SAP NetWeaver and ABAP Platform from SAP, with a CVSS 3.1 base score of 10.0 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 7.22; 8.04; 7.49, and others listed below. The record does not name a fixed version, so check the vendor advisory. CISA added it to the Known Exploited Vulnerabilities catalogue on August 18, 2022, which means attacks have been observed in the wild.
Attackers are already exploiting this vulnerability, according to CISA.
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.
- CISA's required action: Apply updates per vendor instructions.
- 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 7.22; 8.04; 7.49; 7.53; 7.77; 7.81; 7.85; 7.86; and 5 more ranges | Not stated |
| SAP | SAP Web Dispatcher | 7.49; 7.53; 7.77; 7.81; 7.85; 7.22EXT; 7.86; 7.87 | Not stated |
| SAP | SAP Content Server | 7.53 | Not stated |
| SAP | Content Server | 7.53 | Not stated |
| SAP | Netweaver Application Server Abap | 7.22; 7.49; 7.53; 7.77; 7.81; 7.85; 7.86; 7.87; and 9 more ranges | Not stated |
| SAP | Web Dispatcher | 7.22ext; 7.49; 7.53; 7.77; 7.81; 7.85; 7.86; 7.87 | 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
- ChangedThe attack can reach beyond the vulnerable component into other systems.
- 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:C/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 10.0 | Critical | NVD |
| CVSS 3.1 | 9.8 | Critical | CISA (ADP) |
| CVSS 2.0 | 10.0 | High | NVD |
Official description
SAP NetWeaver Application Server ABAP, SAP NetWeaver Application Server Java, ABAP Platform, SAP Content Server 7.53 and SAP Web Dispatcher are vulnerable for request smuggling and request concatenation. An unauthenticated attacker can prepend a victim's request with arbitrary data. This way, the attacker can execute functions impersonating the victim or poison intermediary Web caches. A successful attack could result in complete compromise of Confidentiality, Integrity and Availability of the system.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Inconsistent Interpretation of HTTP Requests
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
How developers prevent this class of flaw
- Use a web server that employs a strict HTTP parsing procedure, such as Apache.
- Terminate the client session after each request.
More Inconsistent Interpretation of HTTP Requests vulnerabilities (CWE-444)
Timeline
- CVE record published.
- Added to CISA's Known Exploited Vulnerabilities catalogue.
- Deadline for US federal agencies to remediate, set by CISA.
- CISA published its SSVC assessment (exploitation: active, automatable: yes, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-22536US Government Resource
Other references
- launchpad.support.sap.com/#/notes/3123396Permissions Required
Other vulnerabilities in SAP NetWeaver and ABAP Platform
- 7.5 High severity
- 8.9 High severity
- 9.9 Critical severity
- 9.8 Critical severity
- 9.8 Critical severity
Recent Inconsistent Interpretation of HTTP Requests vulnerabilities
- 9.8 Critical severity
- 9.1 Critical severity
- 7.4 High severity
- 7.5 High severity
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