Apache HTTP Server Privilege Escalation Vulnerability
In Apache HTTP Server 2.4 releases 2.4.17 to 2.4.38, with MPM event, worker or prefork, code executing in less-privileged child processes or threads (including scripts executed by an in-process scripting interpreter) could execute…
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 3 / 5
- KEV catalog (CISA)03 Nov 2021
- Exploited in EUVD (ENISA)03 Nov 2021
- Used by ransomwareno
- EPSS above 10 %65.0%
- No account, over the networkno
What to do
Fix
Update to a fixed version: 2.4.38-3
CISA guidance: Apply updates per vendor instructions.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Description ENISA EUVD
In Apache HTTP Server 2.4 releases 2.4.17 to 2.4.38, with MPM event, worker or prefork, code executing in less-privileged child processes or threads (including scripts executed by an in-process scripting interpreter) could execute arbitrary code with the privileges of the parent process (usually root) by manipulating the scoreboard. Non-Unix systems are not affected.
Affected products
- 2.4.17 to 2.4.38
Open source packages OSV
- apache2Debian:13 · CVE-2019-0211fixed in 2.4.38-3
Timeline
-
Published
-
Exploitation reported (ENISA)
-
Added to the KEV catalog
-
CISA remediation due date
-
EPSS peak: 65.0%
References
- cve.org · CVE-2019-0211
- ENISA EUVD · EUVD-2019-1002
- CISA KEV
- FIRST EPSS
- openwall.com
- securityfocus.com
- seclists.org
- synology.com
- packetstormsecurity.com
- usn.ubuntu.com
- lists.fedoraproject.org
- debian.org
- lists.apache.org
- lists.fedoraproject.org
- seclists.org
- exploit-db.com
- httpd.apache.org
- packetstormsecurity.com
- packetstormsecurity.com
- apache.org
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