CVE-2021-42387 Memory corruption in clickhouse
An attacker can trigger a heap out-of-bounds read in ClickHouse via a malicious query, potentially causing a crash or leaking memory.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-42387?
CVE-2021-42387 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 14 Mar 2022. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Heap out-of-bounds read in Clickhouse's LZ4 compression codec when parsing a malicious query. As part of the LZ4::decompressImpl() loop, a 16-bit unsigned user-supplied value ('offset') is read from the compressed data. The offset is later used in the length of a copy operation, without checking the upper bounds of the source of the copy operation.
Weakness: CWE-125
Which versions are affected by CVE-2021-42387?
It affects 2 products.
Products include Clickhouse Clickhouse, Debian Debian Linux.
How do I fix CVE-2021-42387?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-42387 being exploited?
There is no known exploitation of CVE-2021-42387 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2021-42387, GHSA-cf9g-639p-3wvv, UBUNTU-CVE-2021-42387.