Advisory Published

USN-4943-1: XStream vulnerabilities

First published: Tue May 11 2021(Updated: )

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. This issue affected only affected Ubuntu 20.10. (CVE-2020-26217) 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. This issue only affected Ubuntu 20.10. (CVE-2020-26258) It was discovered that XStream was vulnerable to arbitrary file deletion on the local host. A remote attacker could use this to delete arbitrary known files on the host as long as the executing process had sufficient rights only by manipulating the processed input stream. This issue only affected Ubuntu 20.10. (CVE-2020-26259) It was discovered that XStream was vulnerable to denial of service, arbitrary code execution, arbitrary file deletion and server-side forgery attacks. A remote attacker could cause any of those issues by manipulating the processed input stream. (CVE-2021-21341, CVE-2021-21342, CVE-2021-21343 CVE-2021-21344, CVE-2021-21345, CVE-2021-21346, CVE-2021-21347, CVE-2021-21348, CVE-2021-21349, CVE-2021-21350, CVE-2021-21351)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/libxstream-java<1.4.15-1ubuntu0.1
1.4.15-1ubuntu0.1
Ubuntu=21.04
All of
ubuntu/libxstream-java<1.4.11.1-2ubuntu0.1
1.4.11.1-2ubuntu0.1
Ubuntu=20.10
All of
ubuntu/libxstream-java<1.4.11.1-1ubuntu0.2
1.4.11.1-1ubuntu0.2
Ubuntu=20.04
All of
ubuntu/libxstream-java<1.4.11.1-1~18.04.2
1.4.11.1-1~18.04.2
Ubuntu=18.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-4943-1?

    USN-4943-1 is a critical vulnerability that allows remote code execution.

  • How do I fix USN-4943-1?

    To fix USN-4943-1, upgrade to libxstream-java version 1.4.15-1ubuntu0.1 or later.

  • Which versions of Ubuntu are affected by USN-4943-1?

    USN-4943-1 affects Ubuntu 20.10, 21.04, 20.04, and 18.04.

  • What is CVE-2020-26217 in relation to USN-4943-1?

    CVE-2020-26217 is the official identifier for the remote code execution vulnerability addressed in USN-4943-1.

  • Who discovered the vulnerability reported in USN-4943-1?

    The vulnerability in USN-4943-1 was discovered by Zhihong Tian and Hui Lu.

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