High severity · published Mar 14, 2022
CVE-2021-43304
Heap buffer overflow in Clickhouse's LZ4 compression codec when parsing a malicious query
8.8
CVSS
1.7%
EPSS
No
On KEV
Description
Heap buffer overflow in Clickhouse's LZ4 compression codec when parsing a malicious query. There is no verification that the copy operations in the LZ4::decompressImpl loop and especially the arbitrary copy operation wildCopy<copy_amount>(op, ip, copy_end), don’t exceed the destination buffer’s limits.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.7% · higher than 77% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CL
Clickhouse · Clickhouse
before 21.10.2.15 · source: NVD
DL
Debian Linux · Debian
10.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-43304
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-43304
Exploit
https://jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbms
Mailing List
https://lists.debian.org/debian-lts-announce/2022/11/msg00002.html
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