HTTP request smuggling in Netty

1) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU22825

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-16869

CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform HTTP request smuggling attack.

The vulnerability exists due to improper input validation when processing a whitespace before the colon in HTTP headers (e.g. "Transfer-Encoding : chunked"). A remote attacker can send a specially crafted HTTP request and perform HTTP request smuggling attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Netty: 4.1.0 - 4.1.41

CPE2.3

• cpe:2.3:a:netty:netty:4.1.0:*:*:*:*:*:*:
• cpe:2.3:a:netty:netty:4.1.1:*:*:*:*:*:*:
• cpe:2.3:a:netty:netty:4.1.2:*:*:*:*:*:*:

External links

http://access.redhat.com/errata/RHSA-2019:3892
http://github.com/netty/netty/compare/netty-4.1.41.Final...netty-4.1.42.Final
http://github.com/netty/netty/issues/9571
http://lists.apache.org/thread.html/2494a2ac7f66af6e4646a4937b17972a4ec7cd3c7333c66ffd6c639d@%3Cdev.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/2e1cf538b502713c2c42ffa46d81f4688edb5676eb55bd9fc4b4fed7@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/37ed432b8eb35d8bd757f53783ec3e334bd51f514534432bea7f1c3d@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/380f6d2730603a2cd6b0a8bea9bcb21a86c199147e77e448c5f7390b@%3Ccommits.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/3e6d7aae1cca10257e3caf2d69b22f74c875f12a1314155af422569d@%3Cdev.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/519eb0fd45642dcecd9ff74cb3e71c20a4753f7d82e2f07864b5108f@%3Cdev.drill.apache.org%3E
http://lists.apache.org/thread.html/6e1e34c0d5635a987d595df9e532edac212307243bb1b49eead6d55b@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/76540c8b0ed761bfa6c81fa28c13057f13a5448aed079d656f6a3c79@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/9128111213b7b734ffc85db08d8f789b00a85a7f241b708e55debbd0@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/9317fd092b257a0815434b116a8af8daea6e920b6673f4fd5583d5fe@%3Ccommits.druid.apache.org%3E
http://lists.apache.org/thread.html/a0f77c73af32cbe4ff0968bfcbbe80ae6361f3dccdd46f3177547266@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/b0656d359c7d40ec9f39c8cc61bca66802ef9a2a12ee199f5b0c1442@%3Cdev.drill.apache.org%3E
http://lists.apache.org/thread.html/b2cd51795f938632c6f60a4c59d9e587fbacd7f7d0e0a3684850a30f@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/bdf7a5e597346a75d2d884ca48c767525e35137ad59d8f10b8fc943c@%3Cdev.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/cbf6e6a04cb37e9320ad20e437df63beeab1755fc0761918ed5c5a6e@%3Ccommits.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/cf5aa087632ead838f8ac3a42e9837684e7afe6e0fcb7704e0c73bc0@%3Ccommits.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/d14f721e0099b914daebe29bca199fde85d8354253be9d6d3d46507a@%3Ccommits.cassandra.apache.org%3E
http://lists.apache.org/thread.html/d3eb0dbea75ef5c400bd49dfa1901ad50be606cca3cb29e0d01b6a54@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/e192fe8797c192679759ffa6b15e4d0806546945a41d8ebfbc6ee3ac@%3Ccommits.tinkerpop.apache.org%3E
http://lists.apache.org/thread.html/e39931d7cdd17241e69a0a09a89d99d7435bcc59afee8a9628d67769@%3Cdev.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/f6c5ebfb018787c764f000362d59e4b231c0a36b6253aa866de8c64e@%3Ccommits.cassandra.apache.org%3E
http://lists.apache.org/thread.html/f9bc3e55f4e28d1dcd1a69aae6d53e609a758e34d2869b4d798e13cc@%3Cissues.drill.apache.org%3E
http://lists.debian.org/debian-lts-announce/2019/09/msg00035.html

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.