CVE-2020-26258

NameCVE-2020-26258
DescriptionXStream 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2507-1, DSA-4828-1
NVD severitymedium
Debian Bugs977625

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
libxstream-java (PTS)stretch1.4.9-2vulnerable
stretch (security)1.4.11.1-1+deb9u4fixed
buster, buster (security)1.4.11.1-1+deb10u2fixed
bullseye1.4.15-3fixed
bookworm, sid1.4.18-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
libxstream-javasourcestretch1.4.11.1-1+deb9u1DLA-2507-1
libxstream-javasourcebuster1.4.11.1-1+deb10u2DSA-4828-1
libxstream-javasource(unstable)1.4.15-1977625

Notes

https://github.com/x-stream/xstream/security/advisories/GHSA-4cch-wxpw-8p28
https://x-stream.github.io/CVE-2020-26258.html

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