Denial of service in Netty

1) Resource exhaustion

EUVDB-ID: #VU27513

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-11612

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources within ZlibDecoders in Netty while decoding a ZlibEncoded byte stream. A remote attacker can trigger resource exhaustion by passing an overly large ZlibEncoded byte stream to the Netty server, forcing the server to allocate all of its free memory to a single decoder.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Netty: 4.1.0 - 4.1.45

External links

http://github.com/netty/netty/compare/netty-4.1.45.Final...netty-4.1.46.Final
http://github.com/netty/netty/issues/6168
http://github.com/netty/netty/pull/9924
http://lists.apache.org/thread.html/r14446ed58208cb6d97b6faa6ebf145f1cf2c70c0886c0c133f4d3b6f@%3Ccommits.druid.apache.org%3E
http://lists.apache.org/thread.html/r255ed239e65d0596812362adc474bee96caf7ba042c7ad2f3c62cec7@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r281882fdf9ea89aac02fd2f92786693a956aac2ce9840cce87c7df6b@%3Ccommits.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r2958e4d49ee046e1e561e44fdc114a0d2285927501880f15852a9b53@%3Ccommits.druid.apache.org%3E
http://lists.apache.org/thread.html/r31424427cc6d7db46beac481bdeed9a823fc20bb1b9deede38557f71@%3Cnotifications.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r3195127e46c87a680b5d1d3733470f83b886bfd3b890c50df718bed1@%3Ccommits.druid.apache.org%3E
http://lists.apache.org/thread.html/r3ea4918d20d0c1fa26cac74cc7cda001d8990bc43473d062867ef70d@%3Cnotifications.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r4a7e4e23bd84ac24abf30ab5d5edf989c02b555e1eca6a2f28636692@%3Cnotifications.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r5030cd8ea5df1e64cf6a7b633eff145992fbca03e8bfc687cd2427ab@%3Cnotifications.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r5b1ad61552591b747cd31b3a908d5ff2e8f2a8a6847583dd6b7b1ee7@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r7836bbdbe95c99d4d725199f0c169927d4e87ba57e4beeeb699c097a@%3Ccommits.druid.apache.org%3E
http://lists.apache.org/thread.html/r866288c2ada00ce148b7307cdf869f15f24302b3eb2128af33830997@%3Ccommits.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r88e2b91560c065ed67e62adf8f401c417e4d70256d11ea447215a70c@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r8a654f11e1172b0effbfd6f8d5b6ca651ae4ac724a976923c268a42f@%3Ccommits.druid.apache.org%3E
http://lists.apache.org/thread.html/r9c30b7fca4baedebcb46d6e0f90071b30cc4a0e074164d50122ec5ec@%3Ccommits.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/ra98e3a8541a09271f96478d5e22c7e3bd1afdf48641c8be25d62d9f9@%3Ccommits.druid.apache.org%3E
http://lists.apache.org/thread.html/rd302ddb501fa02c5119120e5fc21df9a1c00e221c490edbe2d7ad365@%3Cnotifications.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/re1ea144e91f03175d661b2d3e97c7d74b912e019613fa90419cf63f4@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/ref2c8a0cbb3b8271e5b9a06457ba78ad2028128627186531730f50ef@%3Cnotifications.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/ref3943adbc3a8813aee0e3a9dd919bacbb27f626be030a3c6d6c7f83@%3Ccommits.pulsar.apache.org%3E
http://lists.apache.org/thread.html/rf803b65b4a57589d79cf2e83d8ece0539018d32864f932f63c972844@%3Cnotifications.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/rfd173eac20d5e5f581c8984b685c836dafea8eb2f7ff85f617704cf1@%3Cdev.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/rff8859c0d06b1688344b39097f9685c43b461cf2bc41f60f001704e9@%3Ccommits.zookeeper.apache.org%3E

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.