CVE-2021-0256

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.

Affected Software

VendorProductVersion RangeStatus
Juniper NetworksJunos OS17.3 < 17.3R3-S12affected
Juniper NetworksJunos OS17.4 < 17.4R3-S4affected
Juniper NetworksJunos OS18.1 < 18.1R3-S12affected
Juniper NetworksJunos OS18.3 < 18.3R3-S4affected
Juniper NetworksJunos OS19.1 < 19.1R3-S4affected
Juniper NetworksJunos OS19.3 < 19.3R3-S1, 19.3R3-S2affected
Juniper NetworksJunos OS19.4 < 19.4R2-S3affected
Juniper NetworksJunos OS20.1 < 20.1R2affected
Juniper NetworksJunos OS20.2 < 20.2R1-S3, 20.2R2, 20.2R3affected

Weaknesses

  • CWE-250: CWE-250 Execution with Unnecessary Privileges

Workarounds

Use access lists or firewall filters to limit access to the device only from trusted hosts. Limit shell access to only trusted system administrators.

ADP Enrichment

CVE Program Container

Additional References

References