CVE-2021-31372

Summary

An Improper Input Validation vulnerability in J-Web of Juniper Networks Junos OS allows a locally authenticated J-Web attacker to escalate their privileges to root over the target device. This issue affects: Juniper Networks Junos OS All versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R3-S3; 19.3 versions prior to 19.3R3-S3; 19.4 versions prior to 19.4R3-S5; 20.1 versions prior to 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2, 21.1R3; 21.2 versions prior to 21.2R1-S1, 21.2R2;

Affected Software

VendorProductVersion RangeStatus
Juniper NetworksJunos OSunspecified < 18.3R3-S5affected
Juniper NetworksJunos OS18.4 < 18.4R3-S9affected
Juniper NetworksJunos OS19.1 < 19.1R3-S6affected
Juniper NetworksJunos OS19.2 < 19.2R3-S3affected
Juniper NetworksJunos OS19.3 < 19.3R3-S3affected
Juniper NetworksJunos OS19.4 < 19.4R3-S5affected
Juniper NetworksJunos OS20.1 < 20.1R3-S1affected
Juniper NetworksJunos OS20.2 < 20.2R3-S2affected
Juniper NetworksJunos OS20.3 < 20.3R3-S1affected
Juniper NetworksJunos OS20.4 < 20.4R3affected
Juniper NetworksJunos OS21.1 < 21.1R2, 21.1R3affected
Juniper NetworksJunos OS21.2 < 21.2R1-S1, 21.2R2affected

Weaknesses

  • CWE-20: CWE-20 Improper Input Validation
  • Privilege Escalation

Workarounds

To reduce the risk of exploitation of this issue, use access lists or firewall filters to limit access to only trusted administrative networks, hosts and users.

Alternatively, J-Web can be disabled.

ADP Enrichment

CVE Program Container

Additional References

References