Dell Hybrid Client (DHC): Improper Restriction of Recursive Entity References in DTDs
CVE-2022-34430 is a high-severity improper restriction of recursive entity references in dtds vulnerability in Dell Hybrid Client (DHC) from Dell, 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. The record lists version 1.8 as the first without the flaw, so updating Dell Hybrid Client (DHC) to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.56% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Dell Hybrid Client (DHC) to 1.8 or a later version.
- Update Hybrid Client to 1.8 or a later version.
- Read the advisory on dell.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 |
|---|---|---|---|
| Dell | Dell Hybrid Client (DHC) | before 1.8 | 1.8 |
| Dell | Hybrid Client | 1.5 up to, but not including, 1.8 | 1.8 |
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
- HighData or code can be modified at will.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.1 | High | CNA (emc.com) |
| CVSS 3.1 | 7.5 | High | NVD |
Official description
Dell Hybrid Client below 1.8 version contains a Zip Bomb Vulnerability in UI. A guest privilege attacker could potentially exploit this vulnerability, leading to system files modification.
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.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in Dell Hybrid Client (DHC)
- 8.2 High severity
- 7.1 High severity
Recent Improper Restriction of Recursive Entity References in DTDs vulnerabilities
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 9.8 Critical severity
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