A Improper Validation of Specified Index, Position, or Offset in Input vulnerability in the Juniper DHCP daemon (jdhcpd) of Juniper Networks Junos OS allows an adjacent unauthenticated attacker to cause a crash of jdhcpd and thereby a Denial of Service (DoS).

In a scenario where DHCP relay or local server is configured the problem can be triggered if a DHCPv4 packet with specific options is received leading to a corruption of the options read from the packet. This corruption can then lead to jdhcpd crash and restart.

This issue affects Juniper Networks Junos OS:

• 17.4R1 and later versions prior to 18.4R3-S10;
• 19.1 versions prior to 19.1R3-S7;
• 19.2 versions prior to 19.2R1-S8, 19.2R3-S4;
• 19.3 versions prior to 19.3R3-S4;
• 19.4 versions prior to 19.4R3-S6;
• 20.1 versions prior to 20.1R3-S2;
• 20.2 versions prior to 20.2R3-S3;
• 20.3 versions prior to 20.3R3-S2;
• 20.4 versions prior to 20.4R3-S1;
• 21.1 versions prior to 21.1R2-S2, 21.1R3;
• 21.2 versions prior to 21.2R1-S2, 21.2R2, 21.2R3;
• 21.3 versions prior to 21.3R1-S1, 21.3R2.

To be affected a device must be configured with:

[ forwarding-options dhcp-relay group <group-name> interface ... ]

or

[ system services dhcp-local-server group <group-name> interface ... ]

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

This issue has been assigned  CVE-2022-22179 .

The following software releases have been updated to resolve this specific issue: 18.4R3-S10, 19.1R3-S7, 19.2R1-S8, 19.2R3-S4, 19.3R3-S4, 19.4R3-S6, 20.1R3-S2, 20.2R3-S3, 20.3R3-S2, 20.4R3-S1, 21.1R2-S2, 21.1R3, 21.2R1-S2, 21.2R2, 21.2R3, 21.3R1-S1, 21.3R2, 21.4R1, and all subsequent releases.

This issue is being tracked as  1618977 .

There are no viable workarounds for this issue.