Skip to main content
← All vulnerabilities
CVE-2021-0256

Junos OS: mosquitto Local Privilege Escalation vulnerability in SUID binaries

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 17.3R3-S12, 17.4R3-S4, 18.1R3-S12, 18.3R3-S4, 19.1R3-S4, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

A sensitive information disclosure vulnerability in the mosquitto message broker of Juniper Networks Junos OS may allow a locally authenticated user with shell access the ability to read portions of sensitive files, such as the master.passwd file. Since mosquitto is shipped with setuid permissions enabled and is owned by the root user, this vulnerability may allow a local privileged user the ability to run mosquitto with root privileges and access sensitive information stored on the local filesystem. This issue affects Juniper Networks Junos OS: 17.3 versions prior to 17.3R3-S12, 17.4 versions prior to 17.4R3-S4; 18.1 versions prior to 18.1R3-S12; 18.3 versions prior to 18.3R3-S4; 19.1 versions prior to 19.1R3-S4; 19.3 versions prior to 19.3R3-S1, 19.3R3-S2; 19.4 versions prior to 19.4R2-S3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R1-S3, 20.2R2, 20.2R3.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Juniper Networks Junos OS

    From 17.3 · fixed in 17.3R3-S12; From 17.4 · fixed in 17.4R3-S4; From 18.1 · fixed in 18.1R3-S12; From 18.3 · fixed in 18.3R3-S4; From 19.1 · fixed in 19.1R3-S4; From 19.4 · fixed in 19.4R2-S3; From 20.1 · fixed in 20.1R2

References 1

kb.juniper.net