#VU51837 Inconsistent interpretation of HTTP requests in Netty
Vulnerability identifier: #VU51837
Vulnerability risk: Medium
CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-444
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Netty
Universal components / Libraries /
Libraries used by multiple products
Vendor: Netty project
Description
The vulnerability allows a remote attacker to preform HTTP request smuggling attacks.
The vulnerability exists due to improper validation of HTTP requests in io.netty:netty-codec-http2 in Netty, if the request only uses a single Http2HeaderFrame with the endStream set to to true. A remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers.
Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
Netty: 4.0.0 - 4.1.60
External links
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21295
http://github.com/netty/netty/commit/b0fa4d5aab4215f3c22ce6123dd8dd5f38dc0432
http://github.com/netty/netty/security/advisories/GHSA-f256-j965-7f32
http://github.com/netty/netty/security/advisories/GHSA-wm47-8v5p-wjpj
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
