CVE-2020-26259

NameCVE-2020-26259
DescriptionXStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.15, is vulnerable to an Arbitrary File Deletion on the local host when unmarshalling. The vulnerability may allow a remote attacker to delete arbitrary know files on the host as log as the executing process has sufficient rights 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 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 Bugs977624

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+deb9u2fixed
buster, buster (security)1.4.11.1-1+deb10u2fixed
bullseye, sid1.4.15-2fixed

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)1.4.15-1977624

Notes

https://github.com/x-stream/xstream/security/advisories/GHSA-jfvx-7wrx-43fh
https://x-stream.github.io/CVE-2020-26259.html

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