EasySpider: Improper Limitation of a Pathname to a Restricted Directory
CVE-2024-6746 is a high-severity improper limitation of a pathname to a restricted directory vulnerability in EasySpider from NaiboWang, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited from the same local network by an unauthenticated attacker, without any action from a user. Affected EasySpider versions: 0.6.2. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 3.31% chance of exploitation within 30 days, higher than 89% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of EasySpider you run against the affected versions below, and install the vendor's latest release.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| NaiboWang | EasySpider | 0.6.2 | 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
- AdjacentThe attacker must be on the same local network segment.
- 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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 5.3 | Medium | CNA (vuldb.com) |
| CVSS 3.1 | 4.3 | Medium | CNA (vuldb.com) |
| CVSS 3.1 | 8.8 | High | NVD |
| CVSS 2.0 | 3.3 | Low | CNA (vuldb.com) |
Official description
A vulnerability classified as problematic was found in NaiboWang EasySpider 0.6.2 on Windows. Affected by this vulnerability is an unknown functionality of the file \EasySpider\resources\app\server.js of the component HTTP GET Request Handler. The manipulation with the input /../../../../../../../../../Windows/win.ini leads to path traversal: '../filedir'. The attack needs to be done within the local network. The exploit has been disclosed to the public and may be used. The identifier VDB-271477 was assigned to this vulnerability. NOTE: The code maintainer explains, that this is not a big issue "because the default is that the software runs locally without going through the Internet".
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Limitation of a Pathname to a Restricted Directory
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
How developers prevent this class of flaw
- 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.
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
- Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth.
More Improper Limitation of a Pathname to a Restricted Directory vulnerabilities (CWE-22)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- vuldb.com/?id.271477Third Party Advisory, VDB Entry
- vuldb.com/?submit.371998Third Party Advisory, VDB Entry
Technical write-ups (may include proof of concept)
- github.com/NaiboWang/EasySpider/issues/466Exploit, Issue Tracking
Other references
- vuldb.com/?ctiid.271477Permissions Required
Recent Improper Limitation of a Pathname to a Restricted Directory vulnerabilities
- 9.8 Critical severity
- 7.1 High severity
- 7.5 High severity
- 8.6 High severity
- 8.6 High severity
- 7.8 High severity
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