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Atomicorp WAF Research Note: CVE-2019-11043

PHP-FPM Path Info Buffer Underflow - Remote Code Execution

CVE Details

Status: Attack Blocked by Atomicorp
Technical CPE data

This section lists vulnerable CPE matches retained from the NVD configurations. It supplements the readable affected-product information above.

  • cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
    • Version start (inclusive): 7.1.0
    • Version end (exclusive): 7.1.33
    • NVD match criteria ID: D1C2F51F-19AA-4313-AE96-59F46F55D200
  • cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
    • Version start (inclusive): 7.2.0
    • Version end (exclusive): 7.2.24
    • NVD match criteria ID: D6F43FF3-D1EB-473C-9B3A-96C21F63117D
  • cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
    • Version start (inclusive): 7.3.0
    • Version end (exclusive): 7.3.11
    • NVD match criteria ID: 86C83E2A-D2FD-4A12-BD6A-6D48EDFFACC4
  • cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
    • NVD match criteria ID: 8D305F7A-D159-4716-AB26-5E38BB5CD991
  • cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
    • NVD match criteria ID: 815D70A8-47D3-459C-A32C-9FEACA0659D1
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
    • NVD match criteria ID: F7016A2A-8365-4F1A-89A2-7A19F2BCAE5B
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
    • NVD match criteria ID: 23A7C53F-B80F-4E6A-AFA9-58EEA84BE11D
  • cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*
    • NVD match criteria ID: CD783B0C-9246-47D9-A937-6144FE8BFF0F
  • cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*
    • NVD match criteria ID: A31C8344-3E02-4EB8-8BD8-4C84B7959624
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
    • NVD match criteria ID: DEECE5FC-CACF-4496-A3E7-164736409252
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
    • NVD match criteria ID: 07B237A9-69A3-4A9C-9DA0-4E06BD37AE73
  • cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*
    • NVD match criteria ID: D100F7CE-FC64-4CC6-852A-6136D72DA419
  • cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
    • NVD match criteria ID: 97A4B8DF-58DA-4AB6-A1F9-331B36409BA3
  • cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
    • NVD match criteria ID: 80F0FA5D-8D3B-4C0E-81E2-87998286AF33
  • cpe:2.3:a:tenable:tenable.sc:*:*:*:*:*:*:*:*
    • Version end (exclusive): 5.19.0
    • NVD match criteria ID: 41DBA7C7-8084-45F6-B59D-13A9022C34DF
  • cpe:2.3:a:redhat:software_collections:1.0:*:*:*:*:*:*:*
    • NVD match criteria ID: 9D7EE4B6-A6EC-4B9B-91DF-79615796673F
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
    • NVD match criteria ID: F4CFF558-3C47-480D-A2F0-BABF26042943
  • cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
    • NVD match criteria ID: EE249E1B-A1FD-4E08-AA71-A0E1F10FFE97
  • cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
    • NVD match criteria ID: 33C068A4-3780-4EAB-A937-6082DF847564
  • cpe:2.3:o:redhat:enterprise_linux_eus:7.7:*:*:*:*:*:*:*
    • NVD match criteria ID: 83737173-E12E-4641-BC49-0BD84A6B29D0
  • cpe:2.3:o:redhat:enterprise_linux_eus:8.1:*:*:*:*:*:*:*
    • NVD match criteria ID: 92BC9265-6959-4D37-BE5E-8C45E98992F8
  • cpe:2.3:o:redhat:enterprise_linux_eus:8.2:*:*:*:*:*:*:*
    • NVD match criteria ID: 831F0F47-3565-4763-B16F-C87B1FF2035E
  • cpe:2.3:o:redhat:enterprise_linux_eus:8.4:*:*:*:*:*:*:*
    • NVD match criteria ID: 0E3F09B5-569F-4C58-9FCA-3C0953D107B5
  • cpe:2.3:o:redhat:enterprise_linux_eus:8.6:*:*:*:*:*:*:*
    • NVD match criteria ID: 6C3741B8-851F-475D-B428-523F4F722350
  • cpe:2.3:o:redhat:enterprise_linux_eus:8.8:*:*:*:*:*:*:*
    • NVD match criteria ID: 62C31522-0A17-4025-B269-855C7F4B45C2
  • cpe:2.3:o:redhat:enterprise_linux_eus_compute_node:7.7:*:*:*:*:*:*:*
    • NVD match criteria ID: 6DAA8C42-870A-42B4-AE9F-7C67F4122ED3
  • cpe:2.3:o:redhat:enterprise_linux_for_arm_64:8.0_aarch64:*:*:*:*:*:*:*
    • NVD match criteria ID: 5A47EF78-A5B6-4B89-8B74-EEB0647C549F
  • cpe:2.3:o:redhat:enterprise_linux_for_arm_64_eus:8.1_aarch64:*:*:*:*:*:*:*
    • NVD match criteria ID: 2FF1A19F-8A15-471A-B496-E1B4BA788356
  • cpe:2.3:o:redhat:enterprise_linux_for_arm_64_eus:8.2_aarch64:*:*:*:*:*:*:*
    • NVD match criteria ID: EAD7EC1D-5979-42E6-9DA6-355B53431F3B
  • cpe:2.3:o:redhat:enterprise_linux_for_arm_64_eus:8.4_aarch64:*:*:*:*:*:*:*
    • NVD match criteria ID: AE49DCA5-1B01-4478-A1E9-2E87E948A0C1
  • cpe:2.3:o:redhat:enterprise_linux_for_arm_64_eus:8.6_aarch64:*:*:*:*:*:*:*
    • NVD match criteria ID: 37B7CE5C-BFEA-4F96-9759-D511EF189059
  • cpe:2.3:o:redhat:enterprise_linux_for_arm_64_eus:8.8_aarch64:*:*:*:*:*:*:*
    • NVD match criteria ID: 213593D4-EB5A-4A1B-BDF3-3F043C5F6A6C
  • cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:6.0_s390x:*:*:*:*:*:*:*
    • NVD match criteria ID: C84EAAE7-0249-4EA1-B8D3-E039B03ACDC3
  • cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:7.0_s390x:*:*:*:*:*:*:*
    • NVD match criteria ID: 2148300C-ECBD-4ED5-A164-79629859DD43
  • cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0_s390x:*:*:*:*:*:*:*
    • NVD match criteria ID: 32AF225E-94C0-4D07-900C-DD868C05F554
  • cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:7.7_s390x:*:*:*:*:*:*:*
    • NVD match criteria ID: FFC68D88-3CD3-4A3D-A01B-E9DBACD9B9CB
  • cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.1_s390x:*:*:*:*:*:*:*
    • NVD match criteria ID: 00966AC5-1C84-4B5F-9665-5E99D4AEB3A2
  • cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.2_s390x:*:*:*:*:*:*:*
    • NVD match criteria ID: 0D04F433-CB52-4F3D-8711-39D3BDA27FE3
  • cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.4_s390x:*:*:*:*:*:*:*
    • NVD match criteria ID: 07332196-7E36-4E95-81BC-DD959629C1BE
  • cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.6_s390x:*:*:*:*:*:*:*
    • NVD match criteria ID: B758EDC9-6421-422C-899E-A273D2936D8E
  • cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.8_s390x:*:*:*:*:*:*:*
    • NVD match criteria ID: 22C65F53-D624-48A9-A9B7-4C78A31E19F9
  • cpe:2.3:o:redhat:enterprise_linux_for_power_big_endian:6.0_ppc64:*:*:*:*:*:*:*
    • NVD match criteria ID: 6D8D654F-2442-4EA0-AF89-6AC2CD214772
  • cpe:2.3:o:redhat:enterprise_linux_for_power_big_endian:7.0_ppc64:*:*:*:*:*:*:*
    • NVD match criteria ID: 8BCF87FD-9358-42A5-9917-25DF0180A5A6
  • cpe:2.3:o:redhat:enterprise_linux_for_power_big_endian_eus:7.7_ppc64:*:*:*:*:*:*:*
    • NVD match criteria ID: 8036E2AE-4E44-4FA5-AFFB-A3724BFDD654
  • cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:7.0_ppc64le:*:*:*:*:*:*:*
    • NVD match criteria ID: 7A584AAA-A14F-4C64-8FED-675DC36F69A3
  • cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0_ppc64le:*:*:*:*:*:*:*
    • NVD match criteria ID: 23D471AC-7DCA-4425-AD91-E5D928753A8C
  • cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:7.7_ppc64le:*:*:*:*:*:*:*
    • NVD match criteria ID: 418488A5-2912-406C-9337-B8E85D0C2B57
  • cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.1_ppc64le:*:*:*:*:*:*:*
    • NVD match criteria ID: F505D098-2143-4218-A528-D92BFC017FFD
  • cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.2_ppc64le:*:*:*:*:*:*:*
    • NVD match criteria ID: 96E5CEC7-D3B9-4895-96E9-E26D2ACF1AE3
  • cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.4_ppc64le:*:*:*:*:*:*:*
    • NVD match criteria ID: BB28CF82-799F-4A6E-B1DB-0AB423E6C05D
  • cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.6_ppc64le:*:*:*:*:*:*:*
    • NVD match criteria ID: D9C30C59-07F7-4CCE-B057-052ECCD36DB8
  • cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.8_ppc64le:*:*:*:*:*:*:*
    • NVD match criteria ID: F91F9255-4EE1-43C7-8831-D2B6C228BFD9
  • cpe:2.3:o:redhat:enterprise_linux_for_scientific_computing:7.0:*:*:*:*:*:*:*
    • NVD match criteria ID: 37CE1DC7-72C5-483C-8921-0B462C8284D1
  • cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
    • NVD match criteria ID: 9BBCD86A-E6C7-4444-9D74-F861084090F0
  • cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
    • NVD match criteria ID: 51EF4996-72F4-4FA4-814F-F5991E7A8318
  • cpe:2.3:o:redhat:enterprise_linux_server_aus:7.7:*:*:*:*:*:*:*
    • NVD match criteria ID: 7431ABC1-9252-419E-8CC1-311B41360078
  • cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:*
    • NVD match criteria ID: 6897676D-53F9-45B3-B27F-7FF9A4C58D33
  • cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4:*:*:*:*:*:*:*
    • NVD match criteria ID: E28F226A-CBC7-4A32-BE58-398FA5B42481
  • cpe:2.3:o:redhat:enterprise_linux_server_aus:8.6:*:*:*:*:*:*:*
    • NVD match criteria ID: 76C24D94-834A-4E9D-8F73-624AFA99AAA2
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:7.7:*:*:*:*:*:*:*
    • NVD match criteria ID: 17F256A9-D3B9-4C72-B013-4EFD878BFEA8
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:*
    • NVD match criteria ID: B09ACF2D-D83F-4A86-8185-9569605D8EE1
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:*:*:*:*:*:*:*
    • NVD match criteria ID: AC10D919-57FD-4725-B8D2-39ECB476902F
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:8.6:*:*:*:*:*:*:*
    • NVD match criteria ID: 1272DF03-7674-4BD4-8E64-94004B195448
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:8.8:*:*:*:*:*:*:*
    • NVD match criteria ID: F1CA946D-1665-4874-9D41-C7D963DD1F56
  • cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*
    • NVD match criteria ID: E5ED5807-55B7-47C5-97A6-03233F4FBC3A
  • cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
    • NVD match criteria ID: 825ECE2D-E232-46E0-A047-074B34DB1E97

Vulnerability 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.

  1. Maintain the observed Atomicorp protections. Keep your Atomicorp commercial rules current and confirm that the selected observed rules (390714 ) have not been locally disabled. Atomicorp commercial rules are enabled by default. If you use Atomic WAF, review the applicable policy and rule settings.

  2. Apply the vendor’s remediation. WAF protection is defense in depth and does not replace upgrading or following the affected vendor’s guidance.

    • Affected versions: PHP versions earlier than 7.1.33.
    • Affected versions: PHP versions earlier than 7.2.24.
    • Affected versions: PHP versions earlier than 7.3.11.
    • CNA guidance source: php
    • Vendor workaround: Configuring nginx (or other server that implements the front-end part of the FPM protocol) to check for the existence of the target file before passing it to PHP FPM (e.g. “try_files $uri =404” or “if (-f $uri)” in nginx) for would prevent this vulnerability from happening.
    • CISA KEV required action: Apply updates per vendor instructions.
    • CISA KEV federal remediation due date: 2022-04-15

  3. Validate after changes. Confirm rule updates are current, review WAF events for the affected application, and test application behavior after vendor upgrades, mitigations, or local policy changes.

Research Notes

Atomicorp WAF protections are designed around attack techniques and exploit behaviors, allowing existing protections to apply across multiple vulnerabilities without requiring a unique rule for every CVE.

Public Vulnerability References

Test or Research Source

Research Note Context

This research note documents exploit-technique analysis associated with this vulnerability and references Atomicorp WAF protections observed during engineering review, testing, or validation activities.

Atomicorp security controls are generally designed to identify and mitigate attack techniques and exploit behaviors rather than individual CVE identifiers. As a result, protections developed for one vulnerability may also apply to related attack variants and future vulnerabilities using similar techniques.

Learn More

Atomicorp develops commercially supported security technologies for web applications, servers, endpoints, workloads, and legacy enterprise platforms.

Organizations interested in protecting systems against exploit techniques associated with vulnerabilities such as this one can learn more about:

  • Atomic ModSecurity Rules: commercially maintained WAF rules for ModSecurity deployments, including protections for web attacks, bots, scanners, malware, exploitation attempts, and emerging vulnerability classes.
  • Atomic WAF: an enterprise web application firewall with Atomicorp rules, centralized management, reporting, authentication controls, and operational tooling.
  • Atomic ModSecurity Integrator: a special licensing option for MSPs, MSSPs, OEMs, VARs, reverse proxy providers, and other integrators who want to incorporate Atomicorp ModSecurity rule technology into their own products or services.
  • Atomic OSSEC: an enterprise OSSEC-based intrusion detection, compliance, and security monitoring platform.
  • Atomic Protector: workload protection for Linux, web, cloud, data center, and hybrid environments.

For additional information, product evaluations, or technical discussions, visit https://www.atomicorp.com/ or https://modsecurity.io/ .