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CVE-2019-11043

PHP FastCGI Process Manager (FPM) Buffer Overflow Vulnerability

In PHP versions 7.1.x below 7.1.33, 7.2.x below 7.2.24 and 7.3.x below 7.3.11 in certain configurations of FPM setup it is possible to cause FPM module to write past allocated buffers into the space reserved for FCGI protocol data, thus…

CheckOps priority index
9.5/10 Patch within 24 h
Severity8.7
Probability10.0
Exploitation5/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 99.8% higher than 99.96% of CVEs
CVSS 3.1 8.7 AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:
Exploited for 1,684 days 25 Mar 2022
CISA due date 15 Apr 2022 for US federal agencies

Exploitation probability EPSS · FIRST

05010026 Sep05 Oct15 Oct24 Oct02 Nov
EPSS probability (%)Percentile among all CVEs

Exploitation signals 5 / 5

  • KEV catalog (CISA)25 Mar 2022
  • Exploited in EUVD (ENISA)25 Mar 2022
  • Used by ransomwareyes
  • EPSS above 10 %99.8%
  • No account, over the networkyes

What to do

Fix

Apply the vendor’s fix as soon as it is available.

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 PHP versions 7.1.x below 7.1.33, 7.2.x below 7.2.24 and 7.3.x below 7.3.11 in certain configurations of FPM setup it is possible to cause FPM module to write past allocated buffers into the space reserved for FCGI protocol data, thus opening the possibility of remote code execution.

Affected products

PHPFastCGI Process Manager (FPM)
Affected versions
  • 7.2.x <7.2.24
  • 7.1.x <7.1.33
  • 7.3.x <7.3.11
Weaknesses (CWE)
CWE-120

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

  1. Published

  2. Exploitation reported (ENISA)

  3. Added to the KEV catalog

  4. CISA remediation due date

  5. EPSS peak: 99.8%

References

Other exploited vulnerabilities from the same vendor

  • CVE-2016-10033PHPMailer Command Injection Vulnerability
    9.3 · Background exploitation
  • CVE-2012-1823PHP-CGI Query String Parameter Vulnerability
    9.3 · Background exploitation

Are you affected?

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Sources: CISA KEV · ENISA EUVD · FIRST EPSS · OSV. Public data aggregated by CheckOps, updated automatically. Source texts remain the property of their authors. All exploited vulnerabilities