CVE-2021-21408: Access to restricted PHP code by dynamic static class access in smarty
First published: Mon Jan 10 2022(Updated: )
### Impact Template authors could run restricted static php methods. ### Patches Please upgrade to 3.1.40 or higher. ### References See the [documentation on Smarty security features](https://www.smarty.net/docs/en/advanced.features.tpl#advanced.features.security) on the static_classes access filter. ### For more information If you have any questions or comments about this advisory please open an issue in [the Smarty repo](https://github.com/smarty-php/smarty)
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| composer/smarty/smarty | <3.1.43>=4.0.0<4.0.3 | |
| debian/smarty3 | 3.1.33+20180830.1.3a78a21f+selfpack1-1+deb10u1 3.1.33+20180830.1.3a78a21f+selfpack1-1+deb10u2 3.1.39-2+deb11u1 3.1.47-2 3.1.48-1 | |
| debian/smarty4 | 4.3.0-1+deb12u1 4.3.1-1 | |
| composer/smarty/smarty | >=4.0.0<4.0.3 | 4.0.3 |
| composer/smarty/smarty | <3.1.43 | 3.1.43 |
| Smarty | <3.1.43 | |
| Smarty | >=4.0.0<4.0.3 | |
| Debian Linux | =9.0 | |
| Debian Linux | =10.0 | |
| Debian Linux | =11.0 | |
| Red Hat Fedora | =36 | |
| Red Hat Fedora | =37 |
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Reference Links
- https://github.com/smarty-php/smarty/security/advisories/GHSA-4h9c-v5vg-5m6m
- https://security-tracker.debian.org/tracker/CVE-2021-21408
- https://security-tracker.debian.org/tracker/CVE-2021-29454
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21408
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29454
- https://security-tracker.debian.org/tracker/CVE-2022-29221
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1010375
- https://github.com/smarty-php/smarty/commit/19ae410bf56007a5ef24441cdc6414619cfaf664
- https://github.com/smarty-php/smarty/releases/tag/v3.1.43
- https://github.com/smarty-php/smarty/releases/tag/v4.0.3
- https://lists.debian.org/debian-lts-announce/2022/05/msg00005.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BRAJVDRGCIY5UZ2PQHKDTT7RMKG6WJQQ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L777JIBIWJV34HS7LXPIDWASG7TT4LNI/
- https://security.gentoo.org/glsa/202209-09
- https://www.debian.org/security/2022/dsa-5151
- https://github.com/smarty-php/smarty/commit/28519ca00fe6890ef2d464f8400a16188c4b6f36
- https://nvd.nist.gov/vuln/detail/CVE-2021-21408
- https://github.com/FriendsOfPHP/security-advisories/blob/master/smarty/smarty/CVE-2021-21408.yaml
- https://github.com/advisories/GHSA-4h9c-v5vg-5m6m (Advisory)
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BRAJVDRGCIY5UZ2PQHKDTT7RMKG6WJQQ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L777JIBIWJV34HS7LXPIDWASG7TT4LNI/
Frequently Asked Questions
What is the severity of CVE-2021-21408?
CVE-2021-21408 has been classified as a high-severity vulnerability due to its potential to allow unrestricted execution of static PHP methods.
How do I fix CVE-2021-21408?
To mitigate CVE-2021-21408, you should upgrade Smarty to version 3.1.40 or higher or 4.0.3.
Which versions of Smarty are affected by CVE-2021-21408?
CVE-2021-21408 affects versions of Smarty prior to 3.1.40 and those in the 4.0.0 to 4.0.3 range.
What type of vulnerability is CVE-2021-21408?
CVE-2021-21408 is a security vulnerability that allows template authors to execute restricted static PHP methods.
Where can I find more details about CVE-2021-21408?
Detailed information about CVE-2021-21408 can typically be found in the security advisories issued by Smarty.
- collector/friends-of-php
- collector/debian-bugs
- alias/CVE-2021-21408
- collector/security-tracker-debian
- agent/type
- collector/github-advisory-latest
- source/GitHub
- alias/GHSA-4h9c-v5vg-5m6m
- agent/software-canonical-lookup
- agent/severity
- agent/weakness
- agent/remedy
- agent/description
- agent/references
- agent/author
- collector/github-advisory
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/title
- agent/event
- agent/first-publish-date
- agent/trending
- agent/source
- collector/nvd-cve
- source/NVD
- agent/software-canonical-lookup-request
- agent/softwarecombine
- agent/tags
- collector/nvd-index
- package-manager/composer
- package-manager/debian
- vendor/smarty
- canonical/smarty
- version/smarty/4.0.0
- vendor/debian
- canonical/debian linux
- version/debian linux/9.0
- version/debian linux/10.0
- version/debian linux/11.0
- vendor/fedoraproject
- canonical/red hat fedora
- version/red hat fedora/36
- version/red hat fedora/37