CVE-2022-1292
Description
A flaw was found in OpenSSL. The c_rehash script does not properly sanitize shell meta-characters to prevent command injection. Some operating systems distribute this script in a manner where it is automatically executed. This flaw allows an attacker to execute arbitrary commands with the privileges of the script on these operating systems.
Statement
Red Hat Enterprise Linux uses a system-wide store of trusted certificates bundled in a single file and updated via update-ca-trust. The c_rehash script is not included in the default installation on any supported RHEL version, and is never executed automatically. For these reasons, this flaw has been rated as having a security impact of Moderate.
Red Hat Enterprise Linux 7 provides a vulnerable version of the c_rehash script in the openssl-perl package, available only through the unsupported Optional repository. As the Optional repository is not supported and Red Hat Enterprise Linux 7 is in Maintenance Support 2 Phase, this issue is not planned to be addressed there.
Red Hat Satellite ships an affected version of the c_rehash script embedded in puppet-agent package, however, the product is not vulnerable since it does not execute scripts with untrusted data. Moreover, the scriplet is owned by root user and is supposed to be accessed only by administrators.
Red Hat updates the OpenSSL compatibility packages (compat-openssl) to only address Important or Critical security issues with backported security patches.
Mitigation
As mentioned in the upstream security advisory, use of the c_rehash script is considered obsolete and should be replaced by the OpenSSL rehash command line tool.
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 | 6.7 | 7.3 | 9.8 |
| Attack Vector | Local | Local | Network |
| Attack Complexity | Low | Low | Low |
| Privileges Required | High | Low | None |
| User Interaction | None | Required | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | High | High | High |
| Integrity Impact | High | High | High |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat CVSS v3 Score Explanation
The command injection relies on the script processing a specially crafted certificate on the file system. There is no way to run the script over the network in Red Hat Enterprise Linux. As a result, Red Hat has set the Attack Vector to Local and Privileged Required to High as the script requires write permissions to the system-wide store location and the attacker needs to first create such a file.
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If a malicious user injects a character (such as a semi-colon) that delimits the end of one command and the beginning of another, it may be possible to then insert an entirely new and unrelated command that was not intended to be executed. This gives an attacker a privilege or capability that they would not otherwise have.
Acknowledgements
Upstream acknowledges Elison Niven (Sophos) as the original reporter.
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