PT-2021-19884 · Powermux · Powermux

Andrew Burian · Published 2021-06-29 · Updated 2022-01-11 · CVE-2021-32721

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions PowerMux versions prior to 1.1.1

Description PowerMux is a drop-in replacement for Go's http.ServeMux. Attackers may be able to craft phishing links and other open redirects by exploiting the trailing slash redirection feature. This may lead to users being redirected to untrusted sites after following an attacker crafted link. You may detect attempts to craft URLs that exploit this feature by looking for request paths containing pairs of forward slashes in sequence combined with a trailing slash, e.g., https://example.com//foo/.

Recommendations For versions prior to 1.1.1, update to version 1.1.1 to resolve the issue. As a temporary workaround, consider monitoring request paths for pairs of forward slashes in sequence combined with a trailing slash to detect potential exploitation attempts.

Fix

Open Redirect

Weakness Enumeration

CWE-601

Related Identifiers

CVE-2021-32721

GHSA-MJ9R-WWM8-7Q52

GO-2021-0237

Affected Products

Powermux

References · 9

• https://osv.dev/vulnerability/GO-2021-0237 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-32721 · Security Note
• https://osv.dev/vulnerability/CVE-2021-32721 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-mj9r-wwm8-7q52 · Vendor Advisory
• https://github.com/AndrewBurian/powermux/security/advisories/GHSA-mj9r-wwm8-7q52 · Note
• https://github.com/AndrewBurian/powermux/commit/5e60a8a0372b35a898796c2697c40e8daabed8e9 · Note
• https://github.com/AndrewBurian/powermux/pull/42 · Note
• https://t.me/cibsecurity/25799 · Telegram Post
• https://t.me/cvenotify/17140 · Telegram Post