CVE-2021-37634 – github.com/vapor/leaf-kit

Package

Manager: swift
Name: github.com/vapor/leaf-kit
Vulnerable Version: >=0 <1.3.0

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:H/SI:H/SA:N

EPSS: 0.00311 pctl0.53669

Details

LeafKit allows XSS with untrusted user input ### Impact This affects anyone passing unsanitised data to Leaf's variable tags. Before this fix, Leaf would not escape any strings passed to tags as variables. If an attacker managed to find a variable that was rendered with their unsanitised data, they could inject scripts into a generated Leaf page, which could enable XSS attacks if other mitigations such as a Content Security Policy were not enabled. ### Patches This has been patched in 1.3.0 ### Workarounds Sanitise any untrusted input before passing it to Leaf and enable a CSP to block inline script and CSS data. ### References https://github.com/vapor/leaf-kit-ghsa-rv3x-xq3r-8j9h/pull/1 ### For more information If you have any questions or comments about this advisory: * Open an issue in [Leaf Kit](https://github.com/vapor/leaf-kit) * Email us at [security@vapor.codes](mailto:security@vapor.codes)

Metadata

Created: 2023-06-09T19:32:32Z
Modified: 2023-06-09T19:32:32Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/06/GHSA-rv3x-xq3r-8j9h/GHSA-rv3x-xq3r-8j9h.json
CWE IDs: ["CWE-79", "CWE-80"]
Alternative ID: GHSA-rv3x-xq3r-8j9h
Finding: F008
Auto approve: 1