CVE-2023-31122
Description
A flaw was found in the mod_macro module of httpd. When processing a very long macro, the null byte terminator will not be added, leading to an out-of-bounds read, resulting in a crash.
Statement
This flaw only affects configurations with mod_macro loaded and when a very long macro is configured and used, specifically a macro longer than 8191 characters. If these conditions are not present, the server is not affected and no further mitigation is needed. For more information about the mitigation, see the mitigation section below.
The httpd mod_macro module is enabled by default in Red Hat Enterprise Linux 8, 9, and in RHSCL. However, there are no macros used in the default httpd configuration.
Mitigation
Disabling mod_macro and restarting httpd or making sure the macros used are smaller than the required length to trigger this vulnerability will mitigate this flaw. Furthermore, it's unlikely that a very long macro with the length needed to trigger this issue is being used.
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 | 7.5 | 7.5 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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