Vulnerability identifier: #VU51835

Vulnerability risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-21290

CWE-ID: CWE-312

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Netty
Universal components / Libraries / Libraries used by multiple products

Vendor: Netty project

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to insecure usage of temporary files in AbstractDiskHttpData method in Netty. The application stores sensitive information in temporary file that has insecure permissions. A local user can view application's temporary file and gain access to potentially sensitive data.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Netty: 4.1.0 - 4.1.58

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External links
http://github.com/netty/netty/commit/c735357bf29d07856ad171c6611a2e1a0e0000ec
http://github.com/netty/netty/security/advisories/GHSA-5mcr-gq6c-3hq2
http://lists.apache.org/thread.html/r0053443ce19ff125981559f8c51cf66e3ab4350f47812b8cf0733a05@%3Cdev.kafka.apache.org%3E
http://lists.apache.org/thread.html/r02e467123d45006a1dda20a38349e9c74c3a4b53e2e07be0939ecb3f@%3Cdev.ranger.apache.org%3E
http://lists.apache.org/thread.html/r0857b613604c696bf9743f0af047360baaded48b1c75cf6945a083c5@%3Cjira.kafka.apache.org%3E
http://lists.apache.org/thread.html/r10308b625e49d4e9491d7e079606ca0df2f0a4d828f1ad1da64ba47b@%3Cjira.kafka.apache.org%3E
http://lists.apache.org/thread.html/r1908a34b9cc7120e5c19968a116ddbcffea5e9deb76c2be4fa461904@%3Cdev.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r2748097ea4b774292539cf3de6e3b267fc7a88d6c8ec40f4e2e87bd4@%3Cdev.kafka.apache.org%3E
http://lists.apache.org/thread.html/r2fda4dab73097051977f2ab818f75e04fbcb15bb1003c8530eac1059@%3Cjira.kafka.apache.org%3E
http://lists.apache.org/thread.html/r326ec431f06eab7cb7113a7a338e59731b8d556d05258457f12bac1b@%3Cdev.kafka.apache.org%3E
http://lists.apache.org/thread.html/r4efed2c501681cb2e8d629da16e48d9eac429624fd4c9a8c6b8e7020@%3Cdev.tinkerpop.apache.org%3E
http://lists.apache.org/thread.html/r59bac5c09f7a4179b9e2460e8f41c278aaf3b9a21cc23678eb893e41@%3Cjira.kafka.apache.org%3E
http://lists.apache.org/thread.html/r5bf303d7c04da78f276765da08559fdc62420f1df539b277ca31f63b@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r5e4a540089760c8ecc2c411309d74264f1dad634ad93ad583ca16214@%3Ccommits.kafka.apache.org%3E
http://lists.apache.org/thread.html/r5e66e286afb5506cdfe9bbf68a323e8d09614f6d1ddc806ed0224700@%3Cjira.kafka.apache.org%3E
http://lists.apache.org/thread.html/r71dbb66747ff537640bb91eb0b2b24edef21ac07728097016f58b01f@%3Ccommits.kafka.apache.org%3E
http://lists.apache.org/thread.html/r743149dcc8db1de473e6bff0b3ddf10140a7357bc2add75f7d1fbb12@%3Cdev.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/r790c2926efcd062067eb18fde2486527596d7275381cfaff2f7b3890@%3Cissues.bookkeeper.apache.org%3E
http://lists.apache.org/thread.html/r7bb3cdc192e9a6f863d3ea05422f09fa1ae2b88d4663e63696ee7ef5@%3Cdev.ranger.apache.org%3E
http://lists.apache.org/thread.html/r9924ef9357537722b28d04c98a189750b80694a19754e5057c34ca48@%3Ccommits.pulsar.apache.org%3E
http://lists.apache.org/thread.html/ra0fc2b4553dd7aaf75febb61052b7f1243ac3a180a71c01f29093013@%3Cjira.kafka.apache.org%3E
http://lists.apache.org/thread.html/ra503756ced78fdc2136bd33e87cb7553028645b261b1f5c6186a121e@%3Cjira.kafka.apache.org%3E
http://lists.apache.org/thread.html/rb06c1e766aa45ee422e8261a8249b561784186483e8f742ea627bda4@%3Cdev.kafka.apache.org%3E
http://lists.apache.org/thread.html/rb51d6202ff1a773f96eaa694b7da4ad3f44922c40b3d4e1a19c2f325@%3Ccommits.pulsar.apache.org%3E
http://lists.apache.org/thread.html/rb592033a2462548d061a83ac9449c5ff66098751748fcd1e2d008233@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/rc0087125cb15b4b78e44000f841cd37fefedfda942fd7ddf3ad1b528@%3Cissues.zookeeper.apache.org%3E
http://lists.apache.org/thread.html/rc488f80094872ad925f0c73d283d4c00d32def81977438e27a3dc2bb@%3Cjira.kafka.apache.org%3E
http://lists.apache.org/thread.html/rcd163e421273e8dca1c71ea298dce3dd11b41d51c3a812e0394e6a5d@%3Ccommits.pulsar.apache.org%3E
http://lists.apache.org/thread.html/rdba4f78ac55f803893a1a2265181595e79e3aa027e2e651dfba98c18@%3Cjira.kafka.apache.org%3E
http://lists.debian.org/debian-lts-announce/2021/02/msg00016.html

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.