PT-2021-15479 · Npm · Koa-Remove-Trailing-Slashes

Apple502J · Published 2021-05-17 · Updated 2022-02-10 · CVE-2021-23384

Positive Technologies (AI Summary)

CVSS v2.0

5.8

Medium

Base vector

AV:N/AC:M/Au:N/C:P/I:P/A:N

Name of the Vulnerable Software and Affected Versions koa-remove-trailing-slashes versions prior to 2.0.2

Description The issue allows for Open Redirect via the use of trailing double slashes in the URL when accessing a vulnerable endpoint, such as https://example.com//attacker.example/. The vulnerable code is in index.js::removeTrailingSlashes(), as the web server uses relative URLs instead of absolute URLs.

Recommendations For versions prior to 2.0.2, update to version 2.0.2 or later to resolve the issue. As a temporary workaround, consider modifying the index.js::removeTrailingSlashes() function to handle trailing double slashes correctly, or restrict access to vulnerable endpoints to minimize the risk of exploitation.

Exploit

Fix

Open Redirect

Weakness Enumeration

CWE-601

Related Identifiers

CVE-2021-23384

GHSA-R773-PMW3-F4MR

SNYK-JS-KOAREMOVETRAILINGSLASHES-1085708

Affected Products

Koa-Remove-Trailing-Slashes

References · 9

• 🔥 https://snyk.io/vuln/SNYK-JS-KOAREMOVETRAILINGSLASHES-1085708 · Exploit
• https://osv.dev/vulnerability/GHSA-r773-pmw3-f4mr · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-23384 · Security Note
• https://osv.dev/vulnerability/CVE-2021-23384 · Vendor Advisory
• https://github.com/vgno/koa-remove-trailing-slashes/commit/e7ce4000e9fe4d957332df1056640a22ebea28ee · Note
• https://github.com/vgno/koa-remove-trailing-slashes/blame/6a01ba8fd019bd3ece44879c553037ad96ba7d47/index.js#L31 · Note
• https://github.com/vgno/koa-remove-trailing-slashes/blame/6a01ba8fd019bd3ece44879c553037ad96ba7d47/index.js%23L31 · Note
• https://github.com/vgno/koa-remove-trailing-slashes · Note
• https://t.me/cvenotify/15012 · Telegram Post