CVE-2021-21707

Description

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.

Weakness classification

• security@php.net: CWE-159
• nvd@nist.gov: NVD-CWE-Other

Primary references

• security@php.net — Exploit, Issue Tracking, Patch, Release Notes, Vendor Advisory
• security@php.net — Issue Tracking, Mailing List
• security@php.net — Third Party Advisory
• security@php.net — Third Party Advisory
• security@php.net — Patch, Release Notes, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Exploit, Issue Tracking, Patch, Release Notes, Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Issue Tracking, Mailing List
• af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Patch, Release Notes, Third Party Advisory