PT-2021-23941 · Armeria · Armeria

Abdallah Zaher · Published 2021-12-02 · Updated 2021-12-06 · CVE-2021-43795

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Name of the Vulnerable Software and Affected Versions: Armeria versions prior to 1.13.4

Description: An attacker can access an Armeria server's local file system beyond its restricted directory by sending an HTTP request whose path contains %2F (encoded /), such as /files/..%2Fsecrets.txt, bypassing Armeria's path validation logic.

Recommendations: For versions prior to 1.13.4, update to Armeria 1.13.4 or above, which contains the hardened path validation logic that handles %2F properly. As a temporary workaround, consider inserting a decorator that performs an additional validation on the request path, such as checking if the path contains %2f or %2F and returning a BAD REQUEST response if it does.

Fix

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

CVE-2021-43795

GHSA-8FP4-RP6C-5GCV

Affected Products

Armeria

References · 9

• https://github.com/line/armeria/commit/e2697a575e9df6692b423e02d731f293c1313284 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-43795 · Security Note
• https://osv.dev/vulnerability/GHSA-8fp4-rp6c-5gcv · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-43795 · Vendor Advisory
• https://github.com/line/armeria/pull/3855 · Note
• https://github.com/line/armeria/security/advisories/GHSA-8fp4-rp6c-5gcv · Note
• https://github.com/line/armeria · Note
• https://t.me/cibsecurity/33275 · Telegram Post
• https://t.me/cvenotify/24115 · Telegram Post