ESB-2020.3748 – [Juniper] Junos OS: Denial of service – Remote/unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.3748
        Junos OS: Receipt of malformed DHCPv6 packets causes jdhcpd
                         to crash (CVE-2020-1671)
                              30 October 2020

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Junos OS
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-1671  

Original Bulletin: 
   http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11068&actp=RSS

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JSA11068 - 2020-10 Security Bulletin: Junos OS: Receipt of malformed DHCPv6 packets causes jdhcpd to crash (CVE-2020-1671)  

PRODUCT AFFECTED:
This issue affects Junos OS 17.4, 18.1, 18.2, 18.2X75, 18.3, 18.4, 19.1, 19.2,
19.3, 19.4, 20.1.

PROBLEM:
On Juniper Networks Junos OS platforms configured as DHCPv6 local server or 

This issue only affects DHCPv6, it does not affect DHCPv4.

This issue affects: Juniper Networks Junos OS

17.4 versions prior to 17.4R2-S12, 17.4R3-S3;
18.1 versions prior to 18.1R3-S11;
18.2 versions prior to 18.2R3-S6;
18.2X75 versions prior to 18.2X75-D65;
18.3 versions prior to 18.3R2-S4, 18.3R3-S3;
18.4 versions prior to 18.4R2-S5, 18.4R3-S4;
19.1 versions prior to 19.1R3-S2;
19.2 versions prior to 19.2R1-S5, 19.2R3;
19.2 version 19.2R2 and later versions;
19.3 versions prior to 19.3R2-S4, 19.3R3;
19.4 versions prior to 19.4R1-S3, 19.4R2-S2, 19.4R3;
20.1 versions prior to 20.1R1-S3, 20.1R2;
This issue does not affect Juniper Networks Junos OS prior to 17.4R1.

The example of DHCPv6 local server configuration stanza affected by this issue is:

[system services dhcp-local-server dhcpv6]
The example of configuration stanza for DHCPv6 Relay Agent affected by this issue is:

[forwarding-options dhcp-relay dhcpv6]
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

This issue has been assigned CVE-2020-1671.

SOLUTION:
The following software releases have been updated to resolve this specific issue:
Junos OS 17.4R2-S12, 17.4R3-S3, 18.1R3-S11, 18.2R3-S6, 18.2X75-D65, 18.3R2-S4, 
18.3R3-S3, 18.4R2-S5, 18.4R3-S4, 19.1R3-S2, 19.2R1-S5, 19.2R3, 19.3R2-S4, 19.3R3,
19.4R1-S3, 19.4R2-S2, 19.4R3, 20.1R1-S3, 20.1R2, 20.2R1 and all subsequent releases.

This issue is being tracked as 1511782.

WORKAROUND:
There are no viable workarounds for this issue.

IMPLEMENTATION:
Software releases or updates are available for download at https://www.juniper.net/support/downloads/.

MODIFICATION HISTORY:
2020-10-14: Initial Publication.

CVSS SCORE:
7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

SEVERITY LEVEL:
High

SEVERITY ASSESSMENT:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common
Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

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This security bulletin is provided as a service to AusCERT's members.  As
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NOTE: This is only the original release of the security bulletin.  It may
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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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