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CVE-2021-21707

Status Candidate

Overview

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.

Related Files

Red Hat Security Advisory 2022-7628-01
Posted Nov 8, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-7628-01 - PHP is an HTML-embedded scripting language commonly used with the Apache HTTP Server. Issues addressed include traversal and use-after-free vulnerabilities.

tags | advisory, web, php, vulnerability
systems | linux, redhat
advisories | CVE-2021-21707, CVE-2021-21708, CVE-2021-32610
SHA-256 | c5085c33c69a944a83481bcd51491bb584588fdd62e2fb35c3424bbef37bc4ef
Red Hat Security Advisory 2022-5491-01
Posted Jul 4, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-5491-01 - PHP is an HTML-embedded scripting language commonly used with the Apache HTTP Server. Issues addressed include buffer overflow and privilege escalation vulnerabilities.

tags | advisory, web, overflow, php, vulnerability
systems | linux, redhat
advisories | CVE-2021-21703, CVE-2021-21707, CVE-2022-31625, CVE-2022-31626
SHA-256 | 36e1c6ff0f104cd3b9632850a092a8a5455e29cb191ef477cb08e06cd0f97920
Ubuntu Security Notice USN-5300-3
Posted Mar 7, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5300-3 - USN-5300-1 fixed vulnerabilities in PHP. This update provides the corresponding updates for Ubuntu 21.10. It was discovered that PHP incorrectly handled certain scripts. An attacker could possibly use this issue to cause a denial of service. It was discovered that PHP incorrectly handled certain inputs. An attacker could possibly use this issue to cause a denial of service, or possibly obtain sensitive information. It was discovered that PHP incorrectly handled certain scripts with XML parsing functions. An attacker could possibly use this issue to obtain sensitive information.

tags | advisory, denial of service, php, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-8923, CVE-2017-9119, CVE-2021-21707
SHA-256 | 79f9d135d4d4a7c56dc43a848d48ffdb653c44069b4fe34f8a66deeb9811750f
Ubuntu Security Notice USN-5300-2
Posted Mar 3, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5300-2 - USN-5300-1 fixed vulnerabilities in PHP. This update provides the corresponding updates for Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. It was discovered that PHP incorrectly handled certain scripts. An attacker could possibly use this issue to cause a denial of service. It was discovered that PHP incorrectly handled certain inputs. An attacker could possibly use this issue to cause a denial of service, or possibly obtain sensitive information. It was discovered that PHP incorrectly handled certain scripts with XML parsing functions. An attacker could possibly use this issue to obtain sensitive information.

tags | advisory, denial of service, php, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-8923, CVE-2017-9119, CVE-2021-21707
SHA-256 | 8d289bff69aa5a1c07a2ec7e6f761299daae4511e4dcce44a32c652a3e06a38e
Debian Security Advisory 5082-1
Posted Feb 28, 2022
Authored by Debian | Site debian.org

Debian Linux Security Advisory 5082-1 - Two security issues were found in PHP, a widely-used open source general purpose scripting language which could result in information disclosure or denial of service.

tags | advisory, denial of service, php, info disclosure
systems | linux, debian
advisories | CVE-2021-21707, CVE-2021-21708
SHA-256 | 0d3f1a5fe1e49457b4ad5606bb3a59b6b219551a7056119efecb97680d9f7506
Ubuntu Security Notice USN-5300-1
Posted Feb 23, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5300-1 - It was discovered that PHP incorrectly handled certain scripts. An attacker could possibly use this issue to cause a denial of service. It was discovered that PHP incorrectly handled certain inputs. An attacker could possibly use this issue to cause a denial of service, or possibly obtain sensitive information. It was discovered that PHP incorrectly handled certain scripts with XML parsing functions. An attacker could possibly use this issue to obtain sensitive information.

tags | advisory, denial of service, php
systems | linux, ubuntu
advisories | CVE-2015-9253, CVE-2017-9119, CVE-2017-9120, CVE-2021-21707
SHA-256 | a3c43189a77d959782469e503170048c773cfe62638b7e5096d7604ac94e195c
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