MIM Assistant: Improper Restriction of XML External Entity Reference
CVE-2023-3892 is a high-severity improper restriction of XML external entity reference vulnerability in MIM Assistant from MIM Software, with a CVSS 3.1 base score of 7.4 out of 10. It can be exploited from the same local 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 MIM Assistant versions: 7.2.10; 7.3.3. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.24% 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
- Check which version of MIM Assistant you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on mimsoftware.com for workarounds and exact fixed builds.
- 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 |
|---|---|---|---|
| MIM Software | MIM Assistant | 7.2.10; 7.3.3 | Not stated |
| MIM Software | MIM Client | 7.2.10; 7.3.3 | Not stated |
| Mimsoftware | Assistant | 7.2.10; 7.3.3 | Not stated |
| Mimsoftware | Client | 7.2.10; 7.3.3 | 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
- LowA basic user account is enough.
- User interaction
- RequiredA user must take an action such as opening a file or link.
- 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:L/UI:R/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 5.6 | Medium | CNA (mimsoftware.com) |
| CVSS 3.1 | 7.4 | High | NVD |
Official description
Improper Restriction of XML External Entity Reference vulnerability in MIM Assistant and Client DICOM RTst Loading modules allows XML Entity Linking / XML External Entities Blowup. In order to take advantage of this vulnerability, an attacker must craft a malicious XML document, embed this document into specific 3rd party private RTst metadata tags, transfer the now compromised DICOM object to MIM, and force MIM to archive and load the data. Users on either version are strongly encouraged to update to an unaffected version (7.2.11+, 7.3.4+). This issue was found and analyzed by MIM Software's internal security team. We are unaware of any proof of concept or actual exploit available in the wild. For more information, visit https://www.mimsoftware.com/cve-2023-3892 https://www.mimsoftware.com/cve-2023-3892 This issue affects MIM Assistant: 7.2.10, 7.3.3; MIM Client: 7.2.10, 7.3.3.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Restriction of XML External Entity Reference
The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.
How developers prevent this class of flaw
- Many XML parsers and validators can be configured to disable external entity expansion.
More Improper Restriction of XML External Entity Reference vulnerabilities (CWE-611)
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
Advisories
Recent Improper Restriction of XML External Entity Reference vulnerabilities
- 8.8 High severity
- 9.1 Critical severity
- 7.5 High severity
- 9.8 Critical severity
- 9.8 Critical severity
- 7.5 High severity
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