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CVE-2021-21707

CVE-2021-21707 · Special characters break path parsing in XML functions

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

In PHP versions 7.3.x below 7.3.33, 7.4.x below 7.4.26 and 8.0.x below 8.0.13, certain XML parsing functions, like simplexml_load_file(), URL-decode the filename passed to them. If that filename contains URL-encoded NUL character, this may cause the function to interpret this as the end of the filename, thus interpreting the filename differently from what the user intended, which may lead it to reading a different file than intended.

CVSS 5.3 · Medium · EPSS 25.3% · Fix available

Published
Updated

Stack: system · php

Affected products and versions

  • php

    Versions
    • ≥ 7.3.x, < 7.3.33: Affected (custom)
    • ≥ 7.4.x, < 7.4.26: Affected (custom)
    • ≥ 8.0.X, < 8.0.13: Affected (custom)

    Update to 7.3.33; Update to 7.4.26; Update to 8.0.13

  • php7.4 Debian:11

    Versions
    • 7.4.21-1+deb11u1
    • 7.4.25-1+deb11u1
    • 7.4.26-1
    Affected ranges
    • ECOSYSTEM: < 7.4.28-1+deb11u1

    Update to 7.4.28-1+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
    • 5.5.9+dfsg-1ubuntu4.29+esm15
    • 5.5.9+dfsg-1ubuntu4.29+esm16
    • 5.5.9+dfsg-1ubuntu4.29+esm17
    • 5.5.9+dfsg-1ubuntu4.29+esm18
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • 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
    • 7.0.33-0ubuntu0.16.04.16+esm2
    Affected ranges
    • ECOSYSTEM: < 7.0.33-0ubuntu0.16.04.16+esm3

    Update to 7.0.33-0ubuntu0.16.04.16+esm3

  • 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
    • 7.2.24-0ubuntu0.18.04.10
    Affected ranges
    • ECOSYSTEM: < 7.2.24-0ubuntu0.18.04.11

    Update to 7.2.24-0ubuntu0.18.04.11

  • 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
    • 7.4.3-4ubuntu2.7
    • 7.4.3-4ubuntu2.8
    • 7.4.3-4ubuntu2.9
    Affected ranges
    • ECOSYSTEM: < 7.4.3-4ubuntu2.10

    Update to 7.4.3-4ubuntu2.10

Original sources

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