medium
6.5
CWE
20
Advisory Published
Updated

CVE-2018-0056: MX Series: L2ALD daemon may crash if a duplicate MAC is learned by two different interfaces

First published: Wed Oct 10 2018(Updated: )

If a duplicate MAC address is learned by two different interfaces on an MX Series device, the MAC address learning function correctly flaps between the interfaces. However, the Layer 2 Address Learning Daemon (L2ALD) daemon might crash when attempting to delete the duplicate MAC address when the particular entry is not found in the internal MAC address table. This issue only occurs on MX Series devices with l2-backhaul VPN configured. No other products or platforms are affected by this issue. Affected releases are Juniper Networks Junos OS: 15.1 versions prior to 15.1R7-S1 on MX Series; 16.1 versions prior to 16.1R4-S12, 16.1R6-S6 on MX Series; 16.2 versions prior to 16.2R2-S7 on MX Series; 17.1 versions prior to 17.1R2-S9 on MX Series; 17.2 versions prior to 17.2R1-S7, 17.2R2-S6 on MX Series; 17.3 versions prior to 17.3R2-S4, 17.3R3-S1 on MX Series; 17.4 versions prior to 17.4R1-S5 on MX Series; 18.1 versions prior to 18.1R2 on MX Series.

Credit: sirt@juniper.net

Affected SoftwareAffected VersionHow to fix
Juniper Junos=15.1
Juniper Junos=15.1-f2
Juniper Junos=15.1-f3
Juniper Junos=15.1-f4
Juniper Junos=15.1-f5
Juniper Junos=15.1-f6
Juniper Junos=15.1-r1
Juniper Junos=15.1-r2
Juniper Junos=15.1-r3
Juniper Junos=15.1-r4
Juniper Junos=15.1-r5
Juniper Junos=15.1-r6
Juniper Junos=16.1
Juniper Junos=16.1-r1
Juniper Junos=16.1-r2
Juniper Junos=16.1-r3
Juniper Junos=16.2
Juniper Junos=16.2-r1
Juniper Junos=17.1
Juniper Junos=17.1-r1
Juniper Junos=17.2
Juniper Junos=17.3
Juniper Junos=17.3-r1
Juniper Junos=17.4
Juniper Junos=17.4-r1
Juniper Junos=18.1
Juniper Junos=18.1-r1

Remedy

The following software releases have been updated to resolve this specific issue: 15.1R7-S1, 16.1R4-S12, 16.1R6-S6, 16.1R7, 16.2R2-S7, 16.2R3, 17.1R2-S9, 17.1R3, 17.2R1-S7, 17.2R2-S6, 17.2R3, 17.3R2-S4, 17.3R3-S1, 17.4R1-S5, 17.4R2, 18.1R2, 18.2R1, and all subsequent releases. This fix has also been proactively committed into Junos OS: 15.1X49-D150, 15.1X53-D235, 15.1X53-D495, 15.1X53-D590, 15.1X53-D68, 18.2X75-D5, and all subsequent releases.

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2018-0056?

    CVE-2018-0056 has a medium severity level due to potential crashes of the Layer 2 Address Learning Daemon.

  • How do I fix CVE-2018-0056?

    To address CVE-2018-0056, update your Junos software to a version that is not affected by this vulnerability.

  • Which versions of Junos are affected by CVE-2018-0056?

    CVE-2018-0056 affects Junos versions 15.1, 16.1, 16.2, 17.1, 17.2, 17.3, 17.4, and 18.1.

  • What impact does CVE-2018-0056 have on network devices?

    CVE-2018-0056 may cause the Layer 2 Address Learning Daemon to crash, potentially disrupting network operations.

  • Can CVE-2018-0056 be exploited remotely?

    CVE-2018-0056 does not require remote exploitation as it is triggered by internal MAC address learning functions.

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