CVE-2019-11043

PHP FastCGI Process Manager (FPM): Buffer Overflow

As of , CVE-2019-11043 in PHP FastCGI Process Manager (FPM) is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch this week.

Exploited
Yes: CISA listed it on 25 March 2022
US federal deadline
15 April 202221 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Known
EPSS score
0.99Higher than 99% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
EPSS when listed
0.96 on 25 March 2022EPSS on the day CISA listed it.
Public exploit
1 Metasploit module and 2 Exploit-DB entries (1 verified)
Fix
No vendor link in CISA's entry

What CISA says to do

Apply updates per vendor instructions.

CISA's required action

What the flaw is

In some versions of PHP in certain configurations of FPM setup, it is possible to cause FPM module to write past allocated buffers allowing the possibility of remote code execution.

CISA's description

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.

The CVE record's description, from php

CVE published
28 October 2019
Assigned by
php
CVSS
8.7 High (CVSS 3.1, from the CNA)
CWE-120
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CISA SSVC, exploitation
active
CISA SSVC, automatable
no
CISA SSVC, technical impact
total

Timeline

  1. The CVE record was published.
  2. Exploit-DB published an exploit (EDB-ID 47553).
  3. Exploit-DB published an exploit (EDB-ID 48182).
  4. CISA added it to its list of exploited vulnerabilities.
  5. The US federal deadline to fix it.

Public exploits

Facts from Metasploit's module list and Exploit-DB's index; we never copy exploit code.

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