untangle: Improper Restriction of Recursive Entity References in DTDs
CVE-2022-33977 is a high-severity improper restriction of recursive entity references in dtds vulnerability in untangle from Christian Stefanescu, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected untangle versions: 1.2.0 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 1.81% chance of exploitation within 30 days, higher than 79% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of untangle you run against the affected versions below, and install the vendor's latest release.
- 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 |
|---|---|---|---|
| Christian Stefanescu | untangle | 1.2.0 and earlier | 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
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by NVD.
Official description
untangle is a python library to convert XML data to python objects. untangle versions 1.2.0 and earlier improperly restricts recursive entity references in DTDs. By exploiting this vulnerability, a remote unauthenticated attacker may cause a denial-of-service (DoS) condition on the server where the product is running.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Restriction of Recursive Entity References in DTDs
The product uses XML documents and allows their structure to be defined with a Document Type Definition (DTD), but it does not properly control the number of recursive definitions of entities.
How developers prevent this class of flaw
- If possible, prohibit the use of DTDs or use an XML parser that limits the expansion of recursive DTD entities.
- Before parsing XML files with associated DTDs, scan for recursive entity declarations and do not continue parsing potentially explosive content.
More Improper Restriction of Recursive Entity References in DTDs vulnerabilities (CWE-776)
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- github.com/stchris/untangle/releases/tag/1.2.1Release Notes, Third Party Advisory
Third-party and government advisories
- github.com/stchris/untangleProduct, Third Party Advisory
- jvn.jp/en/jp/JVN30454777/Third Party Advisory
Other vulnerabilities in untangle
- 7.5 High severity
Recent Improper Restriction of Recursive Entity References in DTDs vulnerabilities
- 7.5 High severity
- 9.8 Critical severity
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