PT-2022-12366 · Imperva · Imperva Web Application Firewall

Carl Livitt · Published 2022-01-14 · Updated 2024-03-29 · CVE-2021-45468

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions Imperva Web Application Firewall (WAF) versions prior to 2021-12-23

Description The issue allows remote unauthenticated attackers to use Content-Encoding: gzip to evade security controls and send malicious HTTP POST requests to web servers behind the WAF.

Recommendations For versions prior to 2021-12-23, update to a version released after 2021-12-23 to resolve the issue. As a temporary workaround, consider restricting the use of Content-Encoding: gzip in HTTP requests until a patch is available.

Exploit

Fix

HTTP Request/Response Smuggling

Weakness Enumeration

CWE-444

Related Identifiers

CVE-2021-45468

Affected Products

Imperva Web Application Firewall

References · 9

• 🔥 https://github.com/0xhaggis/Imperva_gzip_bypass · Exploit
• 🔥 https://bishopfox.com/blog/imperva-eliminates-critical-exposure · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-45468 · Security Note
• https://osv.dev/vulnerability/CVE-2021-45468 · Vendor Advisory
• https://t.me/cvenotify/75110 · Telegram Post
• https://t.me/cvenotify/75061 · Telegram Post
• https://twitter.com/VulmonFeeds/status/1773508973137715484 · Twitter Post
• https://twitter.com/CVEnew/status/1773483303125061930 · Twitter Post
• https://t.me/cvenotify/25513 · Telegram Post