CVE-2020-26258

Published: 16 December 2020

XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.15, a Server-Side Forgery Request vulnerability can be activated when unmarshalling. The vulnerability may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.15. The reported vulnerability does not exist if running Java 15 or higher. No user is affected who followed the recommendation to setup XStream's Security Framework with a whitelist! Anyone relying on XStream's default blacklist can immediately switch to a whilelist for the allowed types to avoid the vulnerability. Users of XStream 1.4.14 or below who still want to use XStream default blacklist can use a workaround described in more detailed in the referenced advisories.

Priority

Cvss 3 Severity Score

7.7

Score breakdown

Status

Package	Release	Status
libxstream-java Launchpad, Ubuntu, Debian	bionic	Released (1.4.11.1-1~18.04.1)
	focal	Released (1.4.11.1-1ubuntu0.1)
	groovy	Released (1.4.11.1-2ubuntu0.1)
	hirsute	Not vulnerable (1.4.15-1)
	impish	Not vulnerable (1.4.15-1)
	jammy	Not vulnerable (1.4.15-1)
	kinetic	Not vulnerable (1.4.15-1)
	precise	Does not exist
	trusty	Needs triage
	upstream	Released (1.4.15-1)
	xenial	Needs triage

Severity score breakdown

Parameter	Value
Base score	7.7
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Changed
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

References

Bugs

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=977625

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