Bug#977624: libxstream-java: CVE-2020-26259: XStream is vulnerable to an Arbitrary File Deletion on the local host when unmarshalling

[Salvatore Bonaccorso]

Source: libxstream-java
Version: 1.4.14-1
Severity: grave
Tags: security upstream
Justification: user security hole
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>
Control: found -1 1.4.11.1-1+deb10u1
Control: found -1 1.4.11.1-1

Hi,

The following vulnerability was published for libxstream-java.

CVE-2020-26259[0]:
| XStream 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2020-26259
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26259
[1] https://github.com/x-stream/xstream/security/advisories/GHSA-jfvx-7wrx-43fh
[2] https://x-stream.github.io/CVE-2020-26259.html

Regards,
Salvatore