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CVE-2021-43859

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Date: February 1, 2022

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.

Language: Java

Severity Score

Related Resources (15)

https://lists.debian.org/debian-lts-announce/2022/02/msg00018.html
https://github.com/x-stream/xstream/commit/e8e88621ba1c85ac3b8620337dd672e0c0c3a846
https://access.redhat.com/security/cve/CVE-2021-43859
https://nvd.nist.gov/vuln/detail/CVE-2021-43859
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XODFRE2ZL64FICBJDOPWOLPTSSAI4U7X/
https://github.com/x-stream/xstream
https://github.com/x-stream/xstream/security/advisories/GHSA-rmr5-cpv2-vgjf
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VACQYG356OHUTD5WQGAQ4L2TTFTAV3SJ/
https://www.oracle.com/security-alerts/cpuapr2022.html
https://x-stream.github.io/CVE-2021-43859.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VACQYG356OHUTD5WQGAQ4L2TTFTAV3SJ
https://www.oracle.com/security-alerts/cpujul2022.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XODFRE2ZL64FICBJDOPWOLPTSSAI4U7X
http://www.openwall.com/lists/oss-security/2022/02/09/1
https://www.mend.io/vulnerability-database/CVE-2021-43859

Severity Score

Weakness Type (CWE)

Deserialization of Untrusted Data

CWE-502

Uncontrolled Resource Consumption ('Resource Exhaustion')

CWE-400

Top Fix

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Upgrade Version

Upgrade to version com.thoughtworks.xstream:xstream:1.4.19

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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