SAP NetWeaver Application server for ABAP and…: Improper Neutralization of Input During Web Page Generation
CVE-2024-34687 is a critical-severity improper neutralization of input during web page generation vulnerability in SAP NetWeaver Application server for ABAP and ABAP Platform from SAP, with a CVSS 3.1 base score of 9.0 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, but only if a user takes part, for example by opening a link or file. Affected SAP NetWeaver Application server for ABAP and ABAP Platform versions: SAP_BASIS 700; SAP_BASIS 701; SAP_BASIS 702, 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 0.4% chance of exploitation within 30 days, which is low compared with other CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Check which version of SAP NetWeaver Application server for ABAP and ABAP Platform you run against the affected versions below, and install the vendor's latest release.
- Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| SAP | SAP NetWeaver Application server for ABAP and ABAP Platform | SAP_BASIS 700; SAP_BASIS 701; SAP_BASIS 702; SAP_BASIS 731; SAP_BASIS 740; SAP_BASIS 750; SAP_BASIS 751; SAP_BASIS 752; and 9 more ranges | Not stated |
| SAP | SAP Basis | 700; 701; 702; 731; 740; 750; 751; 752; and 8 more ranges | 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
- LowA basic user account is enough.
- User interaction
- RequiredA user must take an action such as opening a file or link.
- 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:L/UI:R/S:C/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 6.5 | Medium | CNA (sap.com) |
| CVSS 3.1 | 9.0 | Critical | NVD |
Official description
SAP NetWeaver Application Server for ABAP and ABAP Platform do not sufficiently encode user controlled inputs, resulting in Cross-Site Scripting (XSS) vulnerability. An attacker can control code that is executed within a user’s browser, which could result in modification, deletion of data, including accessing or deleting files, or stealing session cookies which an attacker could use to hijack a user’s session. Hence, this could have impact on 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: Improper Neutralization of Input During Web Page Generation
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
How developers prevent this class of flaw
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. Examples of libraries and frameworks that make it easier to generate properly encoded output include Microsoft's Anti-XSS library, the OWASP ESAPI Encoding module, and Apache Wicket.
- Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide data to the application. Remember that such inputs may be obtained indirectly through API calls.
- For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
More Improper Neutralization of Input During Web Page Generation vulnerabilities (CWE-79)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Other references
- me.sap.com/notes/3448445Permissions Required
Other vulnerabilities in SAP NetWeaver Application server for ABAP and ABAP Platform
- 7.7 High severity
- 9.9 Critical severity
- 8.8 High severity
Recent Improper Neutralization of Input During Web Page Generation vulnerabilities
- 9.0 Critical severity
- 9.3 Critical severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.3 High severity
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