CVE-2021-21707: Special characters break path parsing in XML functions
First published: Mon Nov 15 2021(Updated: )
Fixed bug (special character is breaking the path in xml function). (CVE-2021-21707)
Credit: security@php.net security@php.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| PHP PHP | >=7.3.0<7.3.33 | |
| PHP PHP | >=7.4.0<7.4.26 | |
| PHP PHP | >=8.0.0<8.0.13 | |
| NetApp Clustered Data ONTAP | ||
| Debian Debian Linux | =10.0 | |
| Debian Debian Linux | =11.0 | |
| Tenable Tenable.sc | <5.21.0 | |
| PHP PHP | <8.0.13 | 8.0.13 |
| debian/php7.4 | 7.4.33-1+deb11u5 7.4.33-1+deb11u6 |
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Reference Links
- https://bugs.php.net/bug.php?id=79971
- https://security.netapp.com/advisory/ntap-20211223-0005/
- https://www.debian.org/security/2022/dsa-5082
- https://www.tenable.com/security/tns-2022-09
- https://lists.debian.org/debian-lts-announce/2022/12/msg00030.html
- https://launchpad.net/bugs/cve/CVE-2021-21707
- https://www.php.net/ChangeLog-8.php#8.0.13 (Advisory)
- https://bugs.php.net/79971
- https://github.com/php/php-src/commit/f15f8fc573eb38c3c73e23e0930063a6f6409ed4
- https://security-tracker.debian.org/tracker/CVE-2021-21707
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21707
- https://nvd.nist.gov/vuln/detail/CVE-2021-21707
- https://ubuntu.com/security/CVE-2021-21707
Frequently Asked Questions
What is the vulnerability ID for this bug?
The vulnerability ID for this bug is CVE-2021-21707.
What is the severity level of CVE-2021-21707?
The severity level of CVE-2021-21707 is medium with a severity value of 5.3.
Which versions of PHP are affected by CVE-2021-21707?
PHP versions 7.3.x below 7.3.33, 7.4.x below 7.4.26, and 8.0.x below 8.0.13 are affected by CVE-2021-21707.
How does CVE-2021-21707 impact the affected software?
CVE-2021-21707 can cause certain XML parsing functions in PHP to interpret an URL-encoded NUL character as the end of the filename, potentially leading to file path manipulation.
Where can I find more information about CVE-2021-21707?
More information about CVE-2021-21707 can be found at the following references: [Mitre](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21707), [Ubuntu Security Notices - USN-5300-1](https://ubuntu.com/security/notices/USN-5300-1), [Ubuntu Security Notices - USN-5300-2](https://ubuntu.com/security/notices/USN-5300-2).
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