CVE Catalog

CVE-2020-26259

MediumCVSS 6.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Very high risk
82.39%

100th percentile - higher than 100% of all known CVEs

Summary

XStream before 1.4.15 is vulnerable to arbitrary file deletion on the local host during unmarshalling. A remote attacker can delete known files if the process has sufficient rights by manipulating the processed input stream.

Risk Assessment

An attacker can delete critical files on the server, causing data loss or service disruption. The vulnerability does not exist on Java 15 or higher.

Recommendation

Update XStream to at least version 1.4.15. If using the default blacklist, switch to a whitelist of allowed types.

Other vulnerabilities in XStream

See all
Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS