high
7.1
CWE
401
Advisory Published
Updated

CVE-2024-47493: Junos OS: MX Series: Trio-based FPCs: Continuous physical Interface flaps causes local FPC to crash

First published: Fri Oct 11 2024(Updated: )

A Missing Release of Memory after Effective Lifetime vulnerability in the Packet Forwarding Engine (PFE) of the Juniper Networks Junos OS on the MX Series platforms with Trio-based FPCs allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS). In case of channelized Modular Interface Cards (MICs), every physical interface flap operation will leak heap memory. Over a period of time, continuous physical interface flap operations causes local FPC to eventually run out of memory and crash.   Below CLI command can be used to check the memory usage over a period of time:   user@host> show chassis fpc                 Temp CPU Utilization (%)   CPU Utilization (%) Memory   Utilization (%)   Slot State     (C)  Total  Interrupt     1min   5min   15min DRAM (MB) Heap     Buffer   0 Online       43     41         2                           2048       49         14   1 Online       43     41         2                           2048       49         14   2 Online       43     41         2                           2048       49         14 This issue affects Junos OS on MX Series:  * All versions before 21.2R3-S7,  * from 21.4 before 21.4R3-S6,  * from 22.1 before 22.1R3-S5,  * from 22.2 before 22.2R3-S3,  * from 22.3 before 22.3R3-S2,  * from 22.4 before 22.4R3,  * from 23.2 before 23.2R2,  * from 23.4 before 23.4R2.

Credit: sirt@juniper.net

Affected SoftwareAffected VersionHow to fix
Juniper Junos<21.2R3-S7>=21.4<21.4R3-S6>=22.1<22.1R3-S5>=22.2<22.2R3-S3>=22.3<22.3R3-S2>=22.4<22.4R3>=23.2<23.2R2>=23.4<23.4R2

Remedy

The following software releases have been updated to resolve this specific issue: Junos OS: 21.2R3-S7, 21.4R3-S6, 22.1R3-S5, 22.2R3-S3, 22.3R3-S2, 22.4R3, 23.2R2, 23.4R1, 23.4R2, 24.1R1, and all subsequent releases.

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2024-47493?

    CVE-2024-47493 has a severity rating that indicates it can lead to a Denial of Service (DoS) condition.

  • How do I fix CVE-2024-47493?

    To fix CVE-2024-47493, update your Junos OS to a version that addresses this vulnerability as specified in Juniper's security advisories.

  • What causes CVE-2024-47493?

    CVE-2024-47493 is caused by a Missing Release of Memory vulnerability in the Packet Forwarding Engine of Junos OS.

  • Who is affected by CVE-2024-47493?

    CVE-2024-47493 affects devices running specific versions of Juniper Networks Junos OS on MX Series platforms with Trio-based FPCs.

  • Can CVE-2024-47493 be exploited remotely?

    CVE-2024-47493 requires an adjacent attacker, meaning it cannot be exploited remotely without local network access.

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