Advisory Published

USN-6049-1: Netty vulnerabilities

First published: Fri Apr 28 2023(Updated: )

It was discovered that Netty's Zlib decoders did not limit memory allocations. A remote attacker could possibly use this issue to cause Netty to exhaust memory via malicious input, leading to a denial of service. This issue only affected Ubuntu 16.04 ESM and Ubuntu 20.04 ESM. (CVE-2020-11612) It was discovered that Netty created temporary files with excessive permissions. A local attacker could possibly use this issue to expose sensitive information. This issue only affected Ubuntu 16.04 ESM, Ubuntu 18.04 ESM, and Ubuntu 20.04 ESM. (CVE-2021-21290) It was discovered that Netty did not properly validate content-length headers. A remote attacker could possibly use this issue to smuggle requests. This issue was only fixed in Ubuntu 20.04 ESM. (CVE-2021-21295, CVE-2021-21409) It was discovered that Netty's Bzip2 decompression decoder did not limit the decompressed output data size. A remote attacker could possibly use this issue to cause Netty to exhaust memory via malicious input, leading to a denial of service. This issue only affected Ubuntu 18.04 ESM, Ubuntu 20.04 ESM, Ubuntu 22.04 LTS, and Ubuntu 22.10. (CVE-2021-37136) It was discovered that Netty's Snappy frame decoder function did not limit chunk lengths. A remote attacker could possibly use this issue to cause Netty to exhaust memory via malicious input, leading to a denial of service. (CVE-2021-37137) It was discovered that Netty did not properly handle control chars at the beginning and end of header names. A remote attacker could possibly use this issue to smuggle requests. This issue only affected Ubuntu 18.04 ESM, Ubuntu 20.04 ESM, Ubuntu 22.04 LTS, and Ubuntu 22.10. (CVE-2021-43797) It was discovered that Netty could be made into an infinite recursion when parsing a malformed crafted message. A remote attacker could possibly use this issue to cause Netty to crash, leading to a denial of service. This issue only affected Ubuntu 20.04 ESM, Ubuntu 22.04 LTS, and Ubuntu 22.10. (CVE-2022-41881) It was discovered that Netty did not validate header values under certain circumstances. A remote attacker could possibly use this issue to perform HTTP response splitting via malicious header values. This issue only affected Ubuntu 18.04 ESM, Ubuntu 20.04 ESM, Ubuntu 22.04 LTS, and Ubuntu 22.10. (CVE-2022-41915)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/libnetty-java<1:4.1.48-5ubuntu0.1
1:4.1.48-5ubuntu0.1
Ubuntu Ubuntu=22.10
All of
ubuntu/libnetty-java<1:4.1.48-4+deb11u1build0.22.04.1
1:4.1.48-4+deb11u1build0.22.04.1
Ubuntu Ubuntu=22.04
All of
ubuntu/libnetty-java<1:4.1.45-1ubuntu0.1~esm1
1:4.1.45-1ubuntu0.1~esm1
Ubuntu Ubuntu=20.04
All of
ubuntu/libnetty-java<1:4.1.7-4ubuntu0.1+esm2
1:4.1.7-4ubuntu0.1+esm2
Ubuntu Ubuntu=18.04
All of
ubuntu/libnetty-java<1:4.0.34-1ubuntu0.1~esm1
1:4.0.34-1ubuntu0.1~esm1
Ubuntu Ubuntu=16.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID?

    The vulnerability ID is USN-6049-1.

  • What is the severity of USN-6049-1?

    The severity of USN-6049-1 is not mentioned in the provided information.

  • Which versions of Ubuntu are affected by USN-6049-1?

    Ubuntu 16.04 ESM, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, and Ubuntu 22.10 are affected by USN-6049-1.

  • How does USN-6049-1 vulnerability affect Netty?

    The vulnerability allows a remote attacker to cause Netty to exhaust memory and lead to a denial of service.

  • How can I fix USN-6049-1 vulnerability?

    Update to the latest version of libnetty-java package as mentioned in the Ubuntu security advisory.

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