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CVE-2021-21703

CVE-2021-21703 · PHP-FPM memory access in root process leading to privilege escalation

This page contains facts from public vulnerability sources. Check the original advisory before updating.

In PHP versions 7.3.x up to and including 7.3.31, 7.4.x below 7.4.25 and 8.0.x below 8.0.12, when running PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower-privileged users, it is possible for the child processes to access memory shared with the main process and write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and writes, which can be used to escalate privileges from local unprivileged user to the root user.

CVSS 7.8 · High · EPSS 1.4% · Fix available

Published
Updated

Stack: system · php

Affected products and versions

  • php

    Versions
    • ≥ 7.3.x, ≤ 7.3.31: Affected (custom)
    • ≥ 7.4.x, < 7.4.25: Affected (custom)
    • ≥ 8.0.X, < 8.0.12: Affected (custom)

    Update to 7.4.25; Update to 8.0.12

  • php7.4 Debian:11

    Versions
    • 7.4.21-1+deb11u1
    Affected ranges
    • ECOSYSTEM: < 7.4.25-1+deb11u1

    Update to 7.4.25-1+deb11u1

  • php5 Ubuntu:Pro:14.04:LTS

    Versions
    • 5.5.3+dfsg-1ubuntu2
    • 5.5.3+dfsg-1ubuntu3
    • 5.5.6+dfsg-1ubuntu1
    • 5.5.6+dfsg-1ubuntu2
    • 5.5.8+dfsg-2ubuntu1
    • 5.5.9+dfsg-1ubuntu1
    • 5.5.9+dfsg-1ubuntu2
    • 5.5.9+dfsg-1ubuntu3
    • 5.5.9+dfsg-1ubuntu4
    • 5.5.9+dfsg-1ubuntu4.1
    • 5.5.9+dfsg-1ubuntu4.2
    • 5.5.9+dfsg-1ubuntu4.3
    • 5.5.9+dfsg-1ubuntu4.4
    • 5.5.9+dfsg-1ubuntu4.5
    • 5.5.9+dfsg-1ubuntu4.6
    • 5.5.9+dfsg-1ubuntu4.7
    • 5.5.9+dfsg-1ubuntu4.9
    • 5.5.9+dfsg-1ubuntu4.11
    • 5.5.9+dfsg-1ubuntu4.12
    • 5.5.9+dfsg-1ubuntu4.13
    • 5.5.9+dfsg-1ubuntu4.14
    • 5.5.9+dfsg-1ubuntu4.16
    • 5.5.9+dfsg-1ubuntu4.17
    • 5.5.9+dfsg-1ubuntu4.19
    • 5.5.9+dfsg-1ubuntu4.20
    • 5.5.9+dfsg-1ubuntu4.21
    • 5.5.9+dfsg-1ubuntu4.22
    • 5.5.9+dfsg-1ubuntu4.23
    • 5.5.9+dfsg-1ubuntu4.24
    • 5.5.9+dfsg-1ubuntu4.25
    • 5.5.9+dfsg-1ubuntu4.26
    • 5.5.9+dfsg-1ubuntu4.27
    • 5.5.9+dfsg-1ubuntu4.29
    • 5.5.9+dfsg-1ubuntu4.29+esm1
    • 5.5.9+dfsg-1ubuntu4.29+esm2
    • 5.5.9+dfsg-1ubuntu4.29+esm3
    • 5.5.9+dfsg-1ubuntu4.29+esm4
    • 5.5.9+dfsg-1ubuntu4.29+esm5
    • 5.5.9+dfsg-1ubuntu4.29+esm6
    • 5.5.9+dfsg-1ubuntu4.29+esm8
    • 5.5.9+dfsg-1ubuntu4.29+esm10
    • 5.5.9+dfsg-1ubuntu4.29+esm11
    • 5.5.9+dfsg-1ubuntu4.29+esm12
    • 5.5.9+dfsg-1ubuntu4.29+esm13
    • 5.5.9+dfsg-1ubuntu4.29+esm14
    Affected ranges
    • ECOSYSTEM: < 5.5.9+dfsg-1ubuntu4.29+esm15

    Update to 5.5.9+dfsg-1ubuntu4.29+esm15

  • php7.0 Ubuntu:Pro:16.04:LTS

    Versions
    • 7.0.1-5
    • 7.0.1-6
    • 7.0.2-1
    • 7.0.2-3
    • 7.0.2-4
    • 7.0.2-5
    • 7.0.3-2
    • 7.0.3-3
    • 7.0.3-9ubuntu1
    • 7.0.4-5ubuntu1
    • 7.0.4-5ubuntu2
    • 7.0.4-7ubuntu1
    • 7.0.4-7ubuntu2
    • 7.0.4-7ubuntu2.1
    • 7.0.8-0ubuntu0.16.04.1
    • 7.0.8-0ubuntu0.16.04.2
    • 7.0.8-0ubuntu0.16.04.3
    • 7.0.13-0ubuntu0.16.04.1
    • 7.0.15-0ubuntu0.16.04.1
    • 7.0.15-0ubuntu0.16.04.2
    • 7.0.15-0ubuntu0.16.04.4
    • 7.0.18-0ubuntu0.16.04.1
    • 7.0.22-0ubuntu0.16.04.1
    • 7.0.25-0ubuntu0.16.04.1
    • 7.0.28-0ubuntu0.16.04.1
    • 7.0.30-0ubuntu0.16.04.1
    • 7.0.32-0ubuntu0.16.04.1
    • 7.0.33-0ubuntu0.16.04.1
    • 7.0.33-0ubuntu0.16.04.2
    • 7.0.33-0ubuntu0.16.04.3
    • 7.0.33-0ubuntu0.16.04.4
    • 7.0.33-0ubuntu0.16.04.5
    • 7.0.33-0ubuntu0.16.04.6
    • 7.0.33-0ubuntu0.16.04.7
    • 7.0.33-0ubuntu0.16.04.9
    • 7.0.33-0ubuntu0.16.04.11
    • 7.0.33-0ubuntu0.16.04.12
    • 7.0.33-0ubuntu0.16.04.14
    • 7.0.33-0ubuntu0.16.04.15
    • 7.0.33-0ubuntu0.16.04.16
    • 7.0.33-0ubuntu0.16.04.16+esm1
    Affected ranges
    • ECOSYSTEM: < 7.0.33-0ubuntu0.16.04.16+esm2

    Update to 7.0.33-0ubuntu0.16.04.16+esm2

  • php7.2 Ubuntu:18.04:LTS

    Versions
    • 7.2.1-1ubuntu2
    • 7.2.2-1ubuntu1
    • 7.2.2-1ubuntu2
    • 7.2.3-1ubuntu1
    • 7.2.5-0ubuntu0.18.04.1
    • 7.2.7-0ubuntu0.18.04.1
    • 7.2.7-0ubuntu0.18.04.2
    • 7.2.10-0ubuntu0.18.04.1
    • 7.2.15-0ubuntu0.18.04.1
    • 7.2.15-0ubuntu0.18.04.2
    • 7.2.17-0ubuntu0.18.04.1
    • 7.2.19-0ubuntu0.18.04.1
    • 7.2.19-0ubuntu0.18.04.2
    • 7.2.24-0ubuntu0.18.04.1
    • 7.2.24-0ubuntu0.18.04.2
    • 7.2.24-0ubuntu0.18.04.3
    • 7.2.24-0ubuntu0.18.04.4
    • 7.2.24-0ubuntu0.18.04.6
    • 7.2.24-0ubuntu0.18.04.7
    • 7.2.24-0ubuntu0.18.04.8
    • 7.2.24-0ubuntu0.18.04.9
    Affected ranges
    • ECOSYSTEM: < 7.2.24-0ubuntu0.18.04.10

    Update to 7.2.24-0ubuntu0.18.04.10

  • php7.4 Ubuntu:20.04:LTS

    Versions
    • 7.4.3-4build1
    • 7.4.3-4build2
    • 7.4.3-4ubuntu1
    • 7.4.3-4ubuntu1.1
    • 7.4.3-4ubuntu2.2
    • 7.4.3-4ubuntu2.4
    • 7.4.3-4ubuntu2.5
    • 7.4.3-4ubuntu2.6
    Affected ranges
    • ECOSYSTEM: < 7.4.3-4ubuntu2.7

    Update to 7.4.3-4ubuntu2.7

Original sources

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