Arch Linux Security Advisory ASA-202107-16 ========================================== Severity: Medium Date : 2021-07-06 CVE-ID : CVE-2021-21704 CVE-2021-21705 Package : php7 Type : multiple issues Remote : Yes Link : https://security.archlinux.org/AVG-2133 Summary ======= The package php7 before version 7.4.21-1 is vulnerable to multiple issues including denial of service and insufficient validation. Resolution ========== Upgrade to 7.4.21-1. # pacman -Syu "php7>=7.4.21-1" The problems have been fixed upstream in version 7.4.21. Workaround ========== None. Description =========== - CVE-2021-21704 (denial of service) Multiple bugs in the pdo_firebase module allow a malicious firebase server or man-in-the-middle attacker to crash PHP before versions 8.0.8 and 7.4.21. - CVE-2021-21705 (insufficient validation) A security issue was found in the php_url_parse_ex() function in PHP before versions 8.0.8 and 7.4.21, which leads to FILTER_VALIDATE_URL accepting URLs with invalid userinfo, a different issue from CVE-2020-7071. Impact ====== A remote user could bypass URL validation. Furthermore, a malicious firebase server or man-in-the-middle attacker could crash a PHP application. References ========== https://www.php.net/ChangeLog-8.php#8.0.8 https://www.php.net/ChangeLog-7.php#7.4.21 https://bugs.php.net/bug.php?id=76448 https://bugs.php.net/bug.php?id=76449 https://bugs.php.net/bug.php?id=76450 https://bugs.php.net/bug.php?id=76452 https://github.com/php/php-src/commit/1edd284cd56ce4c23f6fdf66050e4a722e6515... https://github.com/php/php-src/commit/8cb87aabba0b2e284428aabca13401d1ad54bc... https://github.com/php/php-src/commit/921f320ec2baabd24e5ff182d9fb73092eb286... https://github.com/php/php-src/commit/c8620a753114fac789016a4e6ae9c9b1210be1... https://github.com/php/php-src/commit/1d4c3114afe8f7dde51f917cd14dc4600a3a40... https://github.com/php/php-src/commit/922ea3419923c74471f01ff8c6ea30f0a07d8e... https://github.com/php/php-src/commit/08fc2960bccd4f04031d10099c82cf8d76cfa5... https://github.com/php/php-src/commit/e92d5edeeeed809bc3a06b165e4f0a63bcabdb... https://bugs.php.net/bug.php?id=81122 https://github.com/php/php-src/commit/5a1fe88ac120d71064bdd314dce1e49c86ff05... https://github.com/php/php-src/commit/5cea97e083448aaa2352320612541c895178b3... https://security.archlinux.org/CVE-2021-21704 https://security.archlinux.org/CVE-2021-21705