Signiant: Improper Restriction of XML External Entity Reference
CVE-2022-22795 is a critical-severity improper restriction of XML external entity reference vulnerability in Signiant, with a CVSS 3.1 base score of 9.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected Signiant versions: Signiant Build 78045 13.5.0; Signiant Build 79008,14.0.0; Signiant Build 79687 14.1.0, 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 1.06% chance of exploitation within 30 days, higher than 65% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update Manager+agents to 13.5 or a later version.
- 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 |
|---|---|---|---|
| Signiant | Signiant | Signiant Build 78045 13.5.0; Signiant Build 79008,14.0.0; Signiant Build 79687 14.1.0; Signiant Build 79687 15.0.0 | Not stated |
| Signiant | Manager+agents | before 13.5; 14.0; 15.0 | 13.5 |
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
- HighAll data handled by the component can be read.
- 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:H/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 6.8 | Medium | CNA (cyber.gov.il) |
| CVSS 3.1 | 9.1 | Critical | NVD |
| CVSS 2.0 | 6.4 | Medium | NVD |
Official description
Signiant - Manager+Agents XML External Entity (XXE) - Extract internal files of the affected machine An attacker can read all the system files, the product is running with root on Linux systems and nt/authority on windows systems, which allows him to access and extract any file on the systems, such as passwd, shadow, hosts and so on. By gaining access to these files, attackers can steal sensitive information from the victims machine.
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.
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- gov.il/en/departments/faq/cve_advisoriesThird Party Advisory
Recent Improper Restriction of XML External Entity Reference vulnerabilities
- 9.1 Critical severity
- 7.8 High severity
- 7.5 High severity
- 7.5 High severity
- 9.8 Critical severity
- 6.5 Medium severity
SAP NetWeaver XML External Entity (XXE) Exploited
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