Buffer overflow in Juniper Junos OS - CVE-2023-22399

Detailed vulnerability description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

When sFlow is enabled and it monitors a packet forwarded via ECMP, a buffer management vulnerability in the dcpfe process of Juniper Networks Junos OS on QFX10K Series systems allows an attacker to cause the Packet Forwarding Engine (PFE) to crash and restart by sending specific genuine packets to the device, resulting in a Denial of Service (DoS) condition.

 The dcpfe process tries to copy more data into a smaller buffer, which overflows and corrupts the buffer, causing a crash of the dcpfe process.

How to mitigate CVE-2023-22399

Sources

• https://supportportal.juniper.net/s/article/2023-01-Security-Bulletin-Junos-OS-QFX10K-Series-PFE-crash-upon-receipt-of-specific-genuine-packets-when-sFlow-is-enabled-CVE-2023-22399