CVE-2021-29454
Description
Smarty is a template engine for PHP, facilitating the separation of presentation (HTML/CSS) from application logic. Prior to versions 3.1.42 and 4.0.2, template authors could run arbitrary PHP code by crafting a malicious math string. If a math string was passed through as user provided data to the math function, external users could run arbitrary PHP code by crafting a malicious math string. Users should upgrade to version 3.1.42 or 4.0.2 to receive a patch.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | fixed | 3.1.45-1 |
| debian | bullseye | fixed | 3.1.39-2+deb11u1 |
| debian | forky | fixed | 3.1.45-1 |
| debian | sid | fixed | 3.1.45-1 |
| debian | trixie | fixed | 3.1.45-1 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Packagist | smarty/smarty | <3.1.42 | 3.1.42 |
| Packagist | smarty/smarty | >=4.0.0,<4.0.2 | 4.0.2 |
References
- https://github.com/smarty-php/smarty/security/advisories/GHSA-29gp-2c3m-3j6m
- https://nvd.nist.gov/vuln/detail/CVE-2021-29454
- https://github.com/smarty-php/smarty/commit/215d81a9fa3cd63d82fb3ab56ecaf97cf1e7db71
- https://github.com/FriendsOfPHP/security-advisories/blob/master/smarty/smarty/CVE-2021-29454.yaml
- https://github.com/smarty-php/smarty
- https://github.com/smarty-php/smarty/releases/tag/v3.1.42
- https://github.com/smarty-php/smarty/releases/tag/v4.0.2
- 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://packagist.org/packages/smarty/smarty
- https://security.gentoo.org/glsa/202209-09
- https://www.debian.org/security/2022/dsa-5151
- https://www.smarty.net/docs/en/language.function.math.tpl
- https://security-tracker.debian.org/tracker/CVE-2021-29454
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.