Denial of Service by injecting highly recursive collections or maps in XStream
CVE-2021-43859

7.5HIGH

Key Information:

Vendor

X-stream

Status
Xstream
Vendor
CVE Published:
1 February 2022

What is CVE-2021-43859?

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.

Affected Version(s)

xstream < 1.4.19

References

https://github.com/x-stream/xstream/security/advisories/G...
x_refsource_CONFIRM
https://github.com/x-stream/xstream/commit/e8e88621ba1c85...
x_refsource_MISC
https://x-stream.github.io/CVE-2021-43859.html
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2021-43859 : Denial of Service by injecting highly recursive collections or maps in XStream