| Name | CVE-2021-43859 |
| Description | XStream is an open source java library to serialize objects to XML and back again. Versions prior to 1.4.19 may allow a remote attacker to allocate 100% CPU time on the target system depending on CPU type or parallel execution of such a payload resulting in a denial of service only by manipulating the processed input stream. XStream 1.4.19 monitors and accumulates the time it takes to add elements to collections and throws an exception if a set threshold is exceeded. Users are advised to upgrade as soon as possible. Users unable to upgrade may set the NO_REFERENCE mode to prevent recursion. See GHSA-rmr5-cpv2-vgjf for further details on a workaround if an upgrade is not possible. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-2924-1, ELA-564-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libxstream-java (PTS) | jessie, jessie (lts) | 1.4.11.1-1+deb8u6 | fixed |
| stretch (security) | 1.4.11.1-1+deb9u5 | fixed |
| stretch (lts), stretch | 1.4.11.1-1+deb9u6 | fixed |
| buster (security), buster, buster (lts) | 1.4.11.1-1+deb10u4 | vulnerable |
| bullseye (security), bullseye | 1.4.15-3+deb11u2 | vulnerable |
| bookworm | 1.4.20-1 | fixed |
| sid, trixie | 1.4.21-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
[bullseye] - libxstream-java <no-dsa> (Minor issue)
[buster] - libxstream-java <no-dsa> (Minor issue)
https://github.com/x-stream/xstream/security/advisories/GHSA-rmr5-cpv2-vgjf
https://x-stream.github.io/CVE-2021-43859.html
https://github.com/x-stream/xstream/commit/e8e88621ba1c85ac3b8620337dd672e0c0c3a846