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CVE-2020-26259

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-4714-1
Posted Jan 29, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4714-1 - Zhihong Tian and Hui Lu found that XStream was vulnerable to remote code execution. A remote attacker could run arbitrary shell commands by manipulating the processed input stream. It was discovered that XStream was vulnerable to server-side forgery attacks. A remote attacker could request data from internal resources that are not publicly available only by manipulating the processed input stream. Various other issues were also addressed.

tags | advisory, remote, arbitrary, shell, code execution
systems | linux, ubuntu
advisories | CVE-2020-26217, CVE-2020-26258, CVE-2020-26259
MD5 | 3cdeed73f8b46410b7481e928cd50ec1
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