Vulnerability · Published Oct 4, 2021 · Assigned by php
CVE-2021-21705Incorrect URL validation in FILTER_VALIDATE_URL
Medium 4.3
In plain English
A medium-severity improper input validation in PHP from PHP Group. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.1% (higher than 82% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)2.1%top 18.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
In PHP versions 7.3.x below 7.3.29, 7.4.x below 7.4.21 and 8.0.x below 8.0.8, when using URL validation functionality via filter_var() function with FILTER_VALIDATE_URL parameter, an URL with invalid password field can be accepted as valid. This can lead to the code incorrectly parsing the URL and potentially leading to other security implications - like contacting a wrong server or making a wrong access decision.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | apcu-panel | 5.1.18-1.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | libzip | 1.6.1-1.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | libzip-devel | 1.6.1-1.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | libzip-tools | 1.6.1-1.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-bcmath | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-cli | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-common | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-dba | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-dbg | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-devel | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-embedded | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-enchant | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-ffi | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-fpm | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-gd | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-gmp | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-intl | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-json | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-ldap | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-mbstring | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-mysqlnd | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-odbc | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-opcache | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-pdo | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-pear | 1:1.10.12-1.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-pecl-apcu | 5.1.18-1.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-pecl-apcu-devel | 5.1.18-1.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-pecl-rrd | 2.0.1-1.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-pecl-xdebug | 2.9.5-1.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-pecl-zip | 1.18.2-1.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-pgsql | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-process | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-snmp | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-soap | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-xml | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| AlmaLinux:8 | php-xmlrpc | 7.4.19-2.module_el8.6.0+2750+78feabcb | ALSA-2022:1935 |
| Rocky Linux:8 | libzip | 0:1.6.1-1.module+el8.6.0+789+2130c178 | RLSA-2022:1935 |
| Rocky Linux:8 | libzip | 0:1.6.1-1.module+el8.4.0+415+e936cba3 | RLSA-2022:1935 |
| Rocky Linux:8 | php | 0:7.4.19-2.module+el8.6.0+789+2130c178 | RLSA-2022:1935 |
| Rocky Linux:8 | php-pear | 1:1.10.12-1.module+el8.4.0+415+e936cba3 | RLSA-2022:1935 |
| Rocky Linux:8 | php-pear | 1:1.10.12-1.module+el8.6.0+789+2130c178 | RLSA-2022:1935 |
| Rocky Linux:8 | php-pecl-apcu | 0:5.1.18-1.module+el8.6.0+789+2130c178 | RLSA-2022:1935 |
| Rocky Linux:8 | php-pecl-apcu | 0:5.1.18-1.module+el8.4.0+415+e936cba3 | RLSA-2022:1935 |
| Rocky Linux:8 | php-pecl-rrd | 0:2.0.1-1.module+el8.4.0+414+2e7afcdd | RLSA-2022:1935 |
| Rocky Linux:8 | php-pecl-xdebug | 0:2.9.5-1.module+el8.4.0+415+e936cba3 | RLSA-2022:1935 |
| Rocky Linux:8 | php-pecl-zip | 0:1.18.2-1.module+el8.6.0+789+2130c178 | RLSA-2022:1935 |
| Rocky Linux:8 | php-pecl-zip | 0:1.18.2-1.module+el8.4.0+415+e936cba3 | RLSA-2022:1935 |
Affected products (as reported)
Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
References
- https://bugs.php.net/bug.php?id=81122 x_refsource_MISC
- https://www.oracle.com/security-alerts/cpujan2022.html x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20211029-0006/ x_refsource_CONFIRM
- GLSA-202209-20 vendor-advisory, x_refsource_GENTOO