CVE-2021-21290 Information

Description

Netty is an open-source asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In Netty before version 4.1.59.Final there is a vulnerability on Unix-like systems involving an insecure temp file. When netty’s multipart decoders are used local information disclosure can occur via the local system temporary directory if temporary storing uploads on the disk is enabled. On unix-like systems the temporary directory is shared between all user. As such writing to this directory using APIs that do not explicitly set the file/directory permissions can lead to information disclosure. Of note this does not impact modern MacOS Operating Systems. The method \File.createTempFile\ on unix-like systems creates a random file but by default will create this file with the permissions -rw-r–r–. Thus if sensitive information is written to this file other local users can read this information. This is the case in netty’s \AbstractDiskHttpData\ is vulnerable. This has been fixed in version 4.1.59.Final. As a workaround one may specify your own \java.io.tmpdir\ when you start the JVM or use \DefaultHttpDataFactory.setBaseDir(…)\ to set the directory to something that is only readable by the current user.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Reference

https://github.com/netty/netty/security/advisories/GHSA-5mcr-gq6c-3hq2 https://github.com/netty/netty/commit/c735357bf29d07856ad171c6611a2e1a0e0000ec https://lists.debian.org/debian-lts-announce/2021/02/msg00016.html https://lists.apache.org/thread.html/rc488f80094872ad925f0c73d283d4c00d32def81977438e27a3dc2bb@%3Cjira.kafka.apache.org%3E https://lists.apache.org/thread.html/r2748097ea4b774292539cf3de6e3b267fc7a88d6c8ec40f4e2e87bd4@%3Cdev.kafka.apache.org%3E https://lists.apache.org/thread.html/r10308b625e49d4e9491d7e079606ca0df2f0a4d828f1ad1da64ba47b@%3Cjira.kafka.apache.org%3E https://lists.apache.org/thread.html/ra503756ced78fdc2136bd33e87cb7553028645b261b1f5c6186a121e@%3Cjira.kafka.apache.org%3E https://lists.apache.org/thread.html/r2fda4dab73097051977f2ab818f75e04fbcb15bb1003c8530eac1059@%3Cjira.kafka.apache.org%3E https://lists.apache.org/thread.html/r0857b613604c696bf9743f0af047360baaded48b1c75cf6945a083c5@%3Cjira.kafka.apache.org%3E https://lists.apache.org/thread.html/r71dbb66747ff537640bb91eb0b2b24edef21ac07728097016f58b01f@%3Ccommits.kafka.apache.org%3E https://lists.apache.org/thread.html/rdba4f78ac55f803893a1a2265181595e79e3aa027e2e651dfba98c18@%3Cjira.kafka.apache.org%3E https://lists.apache.org/thread.html/ra0fc2b4553dd7aaf75febb61052b7f1243ac3a180a71c01f29093013@%3Cjira.kafka.apache.org%3E https://lists.apache.org/thread.html/r326ec431f06eab7cb7113a7a338e59731b8d556d05258457f12bac1b@%3Cdev.kafka.apache.org%3E https://lists.apache.org/thread.html/r5e4a540089760c8ecc2c411309d74264f1dad634ad93ad583ca16214@%3Ccommits.kafka.apache.org%3E https://lists.apache.org/thread.html/r0053443ce19ff125981559f8c51cf66e3ab4350f47812b8cf0733a05@%3Cdev.kafka.apache.org%3E https://lists.apache.org/thread.html/r743149dcc8db1de473e6bff0b3ddf10140a7357bc2add75f7d1fbb12@%3Cdev.zookeeper.apache.org%3E https://lists.apache.org/thread.html/r5bf303d7c04da78f276765da08559fdc62420f1df539b277ca31f63b@%3Cissues.zookeeper.apache.org%3E https://lists.apache.org/thread.html/r4efed2c501681cb2e8d629da16e48d9eac429624fd4c9a8c6b8e7020@%3Cdev.tinkerpop.apache.org%3E https://lists.apache.org/thread.html/r02e467123d45006a1dda20a38349e9c74c3a4b53e2e07be0939ecb3f@%3Cdev.ranger.apache.org%3E https://lists.apache.org/thread.html/r7bb3cdc192e9a6f863d3ea05422f09fa1ae2b88d4663e63696ee7ef5@%3Cdev.ranger.apache.org%3E https://lists.apache.org/thread.html/rcd163e421273e8dca1c71ea298dce3dd11b41d51c3a812e0394e6a5d@%3Ccommits.pulsar.apache.org%3E https://lists.apache.org/thread.html/r9924ef9357537722b28d04c98a189750b80694a19754e5057c34ca48@%3Ccommits.pulsar.apache.org%3E https://lists.apache.org/thread.html/rb51d6202ff1a773f96eaa694b7da4ad3f44922c40b3d4e1a19c2f325@%3Ccommits.pulsar.apache.org%3E https://lists.apache.org/thread.html/r790c2926efcd062067eb18fde2486527596d7275381cfaff2f7b3890@%3Cissues.bookkeeper.apache.org%3E https://lists.apache.org/thread.html/r5e66e286afb5506cdfe9bbf68a323e8d09614f6d1ddc806ed0224700@%3Cjira.kafka.apache.org%3E https://lists.apache.org/thread.html/rc0087125cb15b4b78e44000f841cd37fefedfda942fd7ddf3ad1b528@%3Cissues.zookeeper.apache.org%3E https://lists.apache.org/thread.html/rb592033a2462548d061a83ac9449c5ff66098751748fcd1e2d008233@%3Cissues.zookeeper.apache.org%3E https://lists.apache.org/thread.html/r59bac5c09f7a4179b9e2460e8f41c278aaf3b9a21cc23678eb893e41@%3Cjira.kafka.apache.org%3E https://lists.apache.org/thread.html/r1908a34b9cc7120e5c19968a116ddbcffea5e9deb76c2be4fa461904@%3Cdev.zookeeper.apache.org%3E https://lists.apache.org/thread.html/rb06c1e766aa45ee422e8261a8249b561784186483e8f742ea627bda4@%3Cdev.kafka.apache.org%3E https://lists.apache.org/thread.html/r2936730ef0a06e724b96539bc7eacfcd3628987c16b1b99c790e7b87@%3Cissues.zookeeper.apache.org%3E https://www.debian.org/security/2021/dsa-4885 https://www.oracle.com/security-alerts/cpuApr2021.html https://lists.apache.org/thread.html/r5c701840aa2845191721e39821445e1e8c59711e71942b7796a6ec29@%3Cusers.activemq.apache.org%3E https://www.oracle.com//security-alerts/cpujul2021.html https://www.oracle.com/security-alerts/cpuoct2021.html https://lists.apache.org/thread.html/r584cf871f188c406d8bd447ff4e2fd9817fca862436c064d0951a071@%3Ccommits.pulsar.apache.org%3E https://security.netapp.com/advisory/ntap-20220210-0011/ https://www.oracle.com/security-alerts/cpuapr2022.html

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

5.5