MS-MPC or MS-MIC crash when passing large fragmented traffic through an ALG

Summary

CVE	CVE-2017-2346
State	PUBLISHED
Assigner	juniper
Source Priority	CVE Program / NVD first with legacy fallback
Published	2017-07-17 13:18:24 UTC
Updated	2025-04-20 01:37:25 UTC
Description	An MS-MPC or MS-MIC Service PIC may crash when large fragmented packets are passed through an Application Layer Gateway (ALG). Repeated crashes of the Service PC can result in an extended denial of service condition. The issue can be seen only if NAT or stateful-firewall rules are configured with ALGs enabled. This issue was caused by the code change for PR 1182910 in Junos OS 14.1X55-D30, 14.1X55-D35, 14.2R7, 15.1R5, and 16.1R2. No other versions of Junos OS and no other Juniper Networks products or platforms are affected by this issue. Affected releases are Juniper Networks Junos OS on MX platforms running: 14.1X55 from 14.1X55-D30 to releases prior to 14.1X55-D35; 14.2R from 14.2R7 to releases prior to 14.2R7-S4, 14.2R8; 15.1R from 15.1R5 to releases prior to 15.1R5-S2, 15.1R6; 16.1R from 16.1R2 to releases prior to 16.1R3-S2, 16.1R4.

Risk And Classification

Primary CVSS: v3.0 5.9 MEDIUM from [email protected]

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo | Denial of service

Version	Source	Type	Score	Severity	Vector
3.0	[email protected]	Primary	5.9	MEDIUM	`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H`
3.0	[email protected]	Secondary	5.9	MEDIUM	`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H`
3.0	CNA	DECLARED	5.9	MEDIUM	`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H`
2.0	[email protected]	Primary	4.3		`AV:N/AC:M/Au:N/C:N/I:N/A:P`

CVSS v3.0 Breakdown

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v2.0 Breakdown

Access Vector

Network

Access Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

AV:N/AC:M/Au:N/C:N/I:N/A:P

NVD Known Affected Configurations (CPE 2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Operating System	Juniper	Junos	14.1x55	All	All	All
Operating System	Juniper	Junos	14.1x55	d30	All	All
Operating System	Juniper	Junos	14.2	r	All	All
Operating System	Juniper	Junos	14.2	r1	All	All
Operating System	Juniper	Junos	14.2	r2	All	All
Operating System	Juniper	Junos	14.2	r3	All	All
Operating System	Juniper	Junos	14.2	r4	All	All
Operating System	Juniper	Junos	14.2	r5	All	All
Operating System	Juniper	Junos	14.2	r6	All	All
Operating System	Juniper	Junos	14.2	r7	All	All
Operating System	Juniper	Junos	15.1	r	All	All
Operating System	Juniper	Junos	15.1	r1	All	All
Operating System	Juniper	Junos	15.1	r2	All	All
Operating System	Juniper	Junos	15.1	r3	All	All
Operating System	Juniper	Junos	15.1	r4	All	All
Operating System	Juniper	Junos	15.1	r5	All	All
Operating System	Juniper	Junos	15.1	r6	All	All
Operating System	Juniper	Junos	16.1	r	All	All
Operating System	Juniper	Junos	16.1	r1	All	All
Operating System	Juniper	Junos	16.1	r2	All	All
Operating System	Juniper	Junos	16.1	r3	All	All
Operating System	Juniper	Junos	16.1	r4	All	All
Hardware	Juniper	Mx	-	All	All	All

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Juniper Networks	Junos OS	affected 14.1X55 from 14.1X55-D30 prior to 14.1X55-D35	MX Series
CNA	Juniper Networks	Junos OS	affected 14.2R from 14.2R7 prior to 14.2R7-S4, 14.2R8	MX Series
CNA	Juniper Networks	Junos OS	affected 15.1R from 15.1R5 prior to 15.1R5-S2, 15.1R6	MX Series
CNA	Juniper Networks	Junos OS	affected 16.1R from 16.1R2 prior to 16.1R3-S2, 16.1R4	MX Series

References

Reference	Source	Link	Tags
2017-07 Security Bulletin: MS-MPC or MS-MIC crash when passing large fragmented traffic through an ALG (CVE-2017-2346) - Juniper Networks	af854a3a-2127-422b-91ae-364da2661108	kb.juniper.net	Vendor Advisory
Juniper Junos on MX Series Routers Fragmented Packet Processing Flaw Lets Remote Users Cause the Target Service to Crash - SecurityTracker	af854a3a-2127-422b-91ae-364da2661108	www.securitytracker.com	Third Party Advisory, VDB Entry
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

Additional Advisory Data

Workarounds

CNA: There are no viable workarounds for this issue. If NAT and stateful-firewall are not required, disabling them in the [edit applications] stanza will mitigate this issue. It is good security practice to limit the exploitable attack surface of critical infrastructure networking equipment. Use access lists or firewall filters to limit access to the device from trusted, administrative networks or hosts.

There are currently no legacy QID mappings associated with this CVE.