Red Hat Enterprise Linux 9: Excessive Iteration
CVE-2023-38200 is a high-severity excessive iteration vulnerability in Red Hat Enterprise Linux 9 from Red Hat, 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. There is no confirmed exploitation so far. EPSS estimates a 1.45% chance of exploitation within 30 days, higher than 74% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Red Hat Enterprise Linux 9 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 |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 9 | Not specified in the record | Not stated |
| Keylime | Keylime | Not specified in the record | Not stated |
| Red Hat | Enterprise Linux | 9.0 | Not stated |
| Red Hat | Enterprise Linux EUS | 9.2 | Not stated |
| Red Hat | Enterprise Linux For IBM Z Systems | 9.0_s390x | Not stated |
| Red Hat | Enterprise Linux For IBM Z Systems EUS | 9.2_s390x | Not stated |
| Red Hat | Enterprise Linux For Power Little Endian | 9.0_ppc64le | Not stated |
| Red Hat | Enterprise Linux For Power Little Endian EUS | 9.0_ppc64le | Not stated |
| Red Hat | Enterprise Linux Server AUS | 9.2 | Not stated |
| Fedora Project | Fedora | 38 | 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.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.5 | High | CNA (redhat.com) |
| CVSS 3.1 | 7.5 | High | NVD |
Official description
A flaw was found in Keylime. Due to their blocking nature, the Keylime registrar is subject to a remote denial of service against its SSL connections. This flaw allows an attacker to exhaust all available connections.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Excessive Iteration
The product performs an iteration or loop without sufficiently limiting the number of times that the loop is executed.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Third-party and government advisories
- access.redhat.com/errata/RHSA-2023:5080Third Party Advisory
- access.redhat.com/security/cve/CVE-2023-38200Third Party Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2222692Issue Tracking, Third Party Advisory
Other references
Other vulnerabilities in Red Hat Enterprise Linux 9
- 7.5 High severity
- 7.5 High severity
- 7.9 High severity
- 7.3 High severity
- 7.5 High severity
- 7.8 High severity
Recent Excessive Iteration vulnerabilities
- 7.5 High severity
- 7.5 High severity
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