#VU25355 Inconsistent interpretation of HTTP requests in Netty - CVE-2019-20444

Vulnerability identifier: #VU25355

Vulnerability risk: Medium

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2019-20444

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 perform HTTP request smuggling attacks.

The vulnerability exists due to incorrect processing of HTTP headers without the colon within the HttpObjectDecoder.java file in Netty. A remote attacker can send a specially crafted HTTP request to the application and perform HTTP request smuggling attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Netty: 4.1.0 - 4.1.43

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External links
http://github.com/netty/netty/compare/netty-4.1.43.Final...netty-4.1.44.Final
http://github.com/netty/netty/issues/9866
http://lists.apache.org/thread.html/r059b042bca47be53ff8a51fd04d95eb01bb683f1afa209db136e8cb7@%3Cdev.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r310d2ce22304d5298ff87f10134f918c87919b452734f9841d95682d@%3Ccommits.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r34912a9b1a5c269a77b8be94ef6fb6d1e9b3c69129719dc00f01cf0b@%3Cdev.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r36fcf538b28f2029e8b4f6b9a772f3b107913a78f09b095c5b153a62@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r489886fe72a98768eed665474cba13bad8d6fe0654f24987706636c5@%3Cdev.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r640eb9b3213058a963e18291f903fc1584e577f60035f941e32f760a@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r70b1ff22ee80e8101805b9a473116dd33265709007d2deb6f8c80bf2@%3Ccommits.druid.apache.org%3E
http://lists.apache.org/thread.html/r804895eedd72c9ec67898286eb185e04df852b0dd5fe53cf5b6138f9@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r91e0fa345c86c128b75a4a791b4b503b53173ff4c13049ac7129d319@%3Cnotifications.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r96e08f929234e8ba1ef4a93a0fd2870f535a1f9ab628fabc46115986@%3Cdev.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r9b20cdac704cf9a583400350e2d5b576fa8417c18ddb961201676c60@%3Ccommits.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/ra2ace4bcb5cf487f72cbcbfa0f8cc08e755ec2b93d7e69f276148b08@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/ra9fbfe7d4830ae675bf34c7c0f8c22fc8a4099f65706c1bc4f54c593@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/rce71d33747010d32d31d90f5d737dae26291d96552f513a266c92fbb@%3Cnotifications.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/re45ee9256d3233c31d78e59ee59c7dc841c7fbd83d0769285b41e948@%3Ccommits.druid.apache.org%3E
http://lists.apache.org/thread.html/rfb55f245b08d8a6ec0fb4dc159022227cd22de34c4419c2fbb18802b@%3Cnotifications.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/rff210a24f3a924829790e69eaefa84820902b7b31f17c3bf2def9114@%3Ccommits.druid.apache.org%3E

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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. However, proof of concept for this vulnerability is available.