CVE-2019-0215
Description
A flaw was found in Apache HTTP Server 2.4 (releases 2.4.37 and 2.4.38). A bug in mod_ssl, when using per-location client certificate verification with TLSv1.3, allowed a client supporting Post-Handshake Authentication to bypass configured access control restrictions. An attacker could perform various unauthorized actions after bypassing the restrictions. The highest threat from this vulnerability is to data confidentiality and integrity.
Statement
This flaw can be exploited for httpd configurations where per-location client certificates are enabled and TLS 1.3 is used.
The attacker can remotely exploit this httpd flaw (AV:N). However the server had to be configured to use per-location client certificate and the attacker needs to have access to the authenticating client certificate (AC:H). No other significant privileges are required by the attacker (PR:L). The result of the attack is bypass of the configured access control restrictions (CI:H). This however does not affect the system beyond the web server itself (S:U).
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.8 | 7.5 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | High | High | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | High | High | N/A |
| Integrity Impact | High | High | N/A |
| Availability Impact | None | High | N/A |
Vector
Red Hat: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Other
Technical Impact: Varies by Context
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