Vulnerability identifier: #VU11849

Vulnerability risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-0022

CWE-ID: CWE-401

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Juniper Junos OS
Operating systems & Components / Operating system

Vendor: Juniper Networks, Inc.

Description
The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists due to an mbuf leak when processing a specific MPLS packet. Approximately 1 mbuf is leaked per each packet processed. The number of mbufs is platform dependent. The following command provides the number of mbufs that are currently in use and maximum number of mbufs that can be allocated on a platform:
  > show system buffers    
  2437/3143/5580 mbufs in use (current/cache/total)
Once the device runs out of mbufs a remote attacker can cause the service to crash.

Mitigation
Update to versions 12.1X46-D76, 12.3X48-D66, 12.3X48-D70, 14.1R9, 14.1X53-D47, 14.2R8, 15.1F2-S19, 15.1F6-S10, 15.1R4-S9, 15.1R5-S7, 15.1R6-S4, 15.1R7, 15.1X49-D131, 15.1X49-D140, 15.1X53-D233, 15.1X53-D471, 15.1X53-D58, 15.1X53-D66, 16.1R3-S8, 16.1R4-S6, 16.1R5, 16.2R1-S6, 16.2R2-S5, 16.2R3, 17.1R1-S7, 17.1R2-S6, 17.1R3, 17.2R1-S5, 17.2R2, 17.3R1 or later.

Vulnerable software versions

Juniper Junos OS: 12.1x46, 12.3x48, 14.1, 14.1x53, 14.2, 15.1, 15.1X49, 15.1X53, 16.1, 16.2, 17.1, 17.2

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External links
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10855&cat=SIRT_1&actp=LIST

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.