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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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