DescriptionTwo four letter word commands "wchp/wchc" are CPU intensive and could cause spike of CPU utilization on Apache ZooKeeper server if abused, which leads to the server unable to serve legitimate client requests. Apache ZooKeeper thru version 3.4.9 and 3.5.2 suffer from this issue, fixed in 3.4.10, 3.5.3, and later.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-986-1, DSA-3871-1
Debian Bugs863811

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
zookeeper (PTS)buster3.4.13-2fixed
buster (security)3.4.13-2+deb10u1fixed
bullseye (security), bullseye3.4.13-6+deb11u1fixed
bookworm, bookworm (security)3.8.0-11+deb12u1fixed
trixie, sid3.9.1-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


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