Sandbox Escape by math function in smarty

CVE-2021-29454 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

Impact

Template authors could run arbitrary PHP code by crafting a malicious math string.
If a math string is passed through as user provided data to the math function, external users could run arbitrary PHP code by crafting a malicious math string.

Patches

Please upgrade to 4.0.2 or 3.1.42 or higher.

References

See documentation on Math function.

For more information

If you have any questions or comments about this advisory please open an issue in the Smarty repo

Basic information

Type
reviewed
Severity
high
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2022-01-12 22:43:00 UTC
Updated
2024-02-07 18:46:21 UTC
GitHub reviewed
2022-01-10 22:08:56 UTC
NVD published
2022-01-10

EPSS Score

Score Percentile
0.64% 70.51%

CVSS Scores

Base score Version Severity Vector
8.1 3.1 —
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.

Identifiers

Type Value
GHSA GHSA-29gp-2c3m-3j6m ↗
CVE CVE-2021-29454 ↗

CWEs

CWE id Name
CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Affected packages (2)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
composer smarty/smarty < 3.1.42 3.1.42 —
composer smarty/smarty >= 4.0.0, < 4.0.2 4.0.2 —

References

cvelogic Threat Intelligence