A critical vulnerability in the processing of inbound IPv6 packets has been identified in Juniper Networks Junos OS on QFX500 Series and EX460 switches. This vulnerability, tracked as CVE-2022-22174, can result in a memory leak and lead to a Denial of Service (DoS) condition. When this occurs, further packet processing may be impacted, leading to a sustained DoS state.
The memory leak issue arises when memory is not freed during the processing of inbound IPv6 packets. This can be observed in the error logs using the "show heap" command:
Jan 12 12:00:00 device-name fpc (buf alloc) failed allocating packet buffer Jan 12 12:00:01 device-name fpc (buf alloc) failed allocating packet buffer user@device-name> request pfe execute target fpc timeout 30 command "show heap" ID Base Total(b) Free(b) Used(b) % Name 246fc1a8 536870488 353653752 183216736 34 Kernel 1 91800000 16777216 12069680 4707536 28 DMA 2 92800000 75497472 69997640 5499832 7 PKT DMA DESC 3 106fc000 335544320 221425960 114118360 34 Bcm_sdk 4 97000000 176160768 200 176160568 99 Packet DMA <<<<<<<<<<<<<< 5 903fffe 20971504 20971504 Blob
Devices may eventually run out of memory if subjected to continuous receipt of such packets.
Juniper Networks Junos OS on QFX500 Series, EX460 devices are affected by this issue if running on the following versions: 18.3R3 versions prior to 18.3R3-S6; 18.4 versions prior to 18.4R2-S9, 18.4R3-S9; 19.1 versions prior to 19.1R2-S3, 19.1R3-S7; 19.2 versions prior to 19.2R1-S8, 19.2R3-S3; 19.3 versions prior to 19.3R2-S7, 19.3R3-S4; 19.4 versions prior to 19.4R2-S5, 19.4R3-S6; 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-S1, 21.1R3; 21.2 versions prior to 21.2R1-S1, 21.2R2.
This issue does not affect devices running on Juniper Networks Junos OS with the following versions: any versions prior to 17.4R3; 18.1 versions prior to 18.1R3-S6; 18.2 versions prior to 18.2R3; 18.3 versions prior to 18.3R3; 18.4 versions prior to 18.4R2; 19.1 versions prior to 19.1R2.
To address this vulnerability, users should consult the original security advisory from Juniper Networks and apply the recommended updates. It is crucial to ensure that your devices are running on the latest, secure versions of Junos OS to protect against any potential exploits of this memory leak vulnerability.
Published on: 01/19/2022 01:15:00 UTC
Last modified on: 02/01/2022 20:33:00 UTC