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Keylime's registrar vulnerable to Denial-of-service attack via a single open connection

High severity GitHub Reviewed Published Aug 1, 2023 in keylime/keylime • Updated Sep 4, 2023

Package

pip keylime (pip)

Affected versions

< 7.4.0

Patched versions

7.4.0

Description

Impact

Keylime registrar is prone to a simple denial of service attack in which an adversary opens a connection to the TLS port (by default, port 8891) blocking further, legitimate connections. As long as the connection is open, the registrar is blocked and cannot serve any further clients (agents and tenants), which prevents normal operation. The problem does not affect the verifier.

Patches

Users should upgrade to release 7.4.0

References

@maugustosilva maugustosilva published to keylime/keylime Aug 1, 2023
Published to the GitHub Advisory Database Aug 1, 2023
Reviewed Aug 1, 2023
Last updated Sep 4, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(67th percentile)

Weaknesses

Excessive Iteration

The product performs an iteration or loop without sufficiently limiting the number of times that the loop is executed. Learn more on MITRE.

CVE ID

CVE-2023-38200

GHSA ID

GHSA-pg75-v6fp-8q59

Source code

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