CVE-2022-22155: 2022-01 Security Bulletin: Junos OS: ACX5448: FPC memory leak due to IPv6 neighbor flaps (CVE-2022-22155)

This issue affects Junos OS 18.4, 19.1, 19.2, 19.3, 19.4, 20.1, 20.2. Affected platforms: ACX5448.

An Uncontrolled Resource Consumption vulnerability in the handling of IPv6 neighbor state change events in Juniper Networks Junos OS allows an adjacent attacker to cause a memory leak in the Flexible PIC Concentrator (FPC) of an ACX5448 router. The continuous flapping of an IPv6 neighbor with specific timing will cause the FPC to run out of resources, leading to a Denial of Service (DoS) condition. Once the condition occurs, further packet processing will be impacted, creating a sustained Denial of Service (DoS) condition, requiring a manual PFE restart to restore service.

The following error messages will be seen after the FPC resources have been exhausted:

fpc0 DNX_NH::dnx_nh_tag_ipv4_hw_install(),3135: dnx_nh_tag_ipv4_hw_install: BCM L3 Egress create object failed for NH 602 (-14:No resources for operation), BCM NH Params: unit:0 Port:41, L3_INTF:0 Flags: 0x40
fpc0 DNX_NH::dnx_nh_tag_ipv4_hw_install(),3135: dnx_nh_tag_ipv4_hw_install: BCM L3 Egress create object failed for NH 602 (-14:No resources for operation), BCM NH Params: unit:0 Port:41, L3_INTF:0 Flags: 0x40
fpc0 DNX_NH::dnx_nh_tag_ipv4_hw_install(),3135: dnx_nh_tag_ipv4_hw_install: BCM L3 Egress create object failed for NH 602 (-14:No resources for operation), BCM NH Params: unit:0 Port:41, L3_INTF:0 Flags: 0x40
fpc0 DNX_NH::dnx_nh_tag_ipv4_hw_install(),3135: dnx_nh_tag_ipv4_hw_install: BCM L3 Egress create object failed for NH 602 (-14:No resources for operation), BCM NH Params: unit:0 Port:41, L3_INTF:0 Flags: 0x40

This issue only affects the ACX5448 router. No other products or platforms are affected by this vulnerability.

This issue affects Juniper Networks Junos OS on ACX5448:

• 18.4 versions prior to 18.4R3-S10;
• 19.1 versions prior to 19.1R3-S5;
• 19.2 versions prior to 19.2R1-S8, 19.2R3-S2;
• 19.3 versions prior to 19.3R2-S6, 19.3R3-S2;
• 19.4 versions prior to 19.4R1-S3, 19.4R2-S2, 19.4R3;
• 20.1 versions prior to 20.1R2;
• 20.2 versions prior to 20.2R1-S1, 20.2R2.

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-2022-22155.

The following software releases have been updated to resolve this specific issue: Junos OS 18.4R3-S10, 19.1R3-S5, 19.2R1-S8, 19.2R3-S2, 19.3R2-S6, 19.3R3-S2, 19.4R1-S3, 19.4R2-S2, 19.4R3, 20.1R2, 20.2R1-S1, 20.2R2, 20.3R1, and all subsequent releases.

This issue is being tracked as 1519372.

There are no known workarounds for this issue.

Software releases or updates are available for download at https://support.juniper.net/support/downloads/

2022-01-12: Initial Publication.

Information for how Juniper Networks uses CVSS can be found at KB 16446 “Common Vulnerability Scoring System (CVSS) and Juniper’s Security Advisories.”