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AUSCERT External Security Bulletin Redistribution
ESB-2020.3731
JSA11077 - 2020-10 Security Bulletin: Junos OS: MX Series: MS-MPC/MIC might
crash when processing malformed IPv6 packet in NAT64
configuration. (CVE-2020-1680)
29 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-2020-1680
Reference: ESB-2020.3730
Original Bulletin:
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11077
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2020-10 Security Bulletin: Junos OS: MX Series: MS-MPC/MIC might crash when processing malformed IPv6 packet in NAT64 configuration. (CVE-2020-1680)
Article ID : JSA11077
Last Updated: 28 Oct 2020
Version : 2.0
Product Affected:
This issue affects Junos OS 15.1, 15.1X53, 16.1, 17.2, 17.3, 17.4, 18.1, 18.2,
18.2X75, 18.3, 18.4, 19.1, 19.2, 19.3. Affected platforms: MX Series.
Problem:
On Juniper Networks MX Series with MS-MIC or MS-MPC card configured with NAT64
configuration, receipt of a malformed IPv6 packet may crash the MS-PIC
component on MS-MIC or MS-MPC.
This issue occurs when a multiservice card is translating the malformed IPv6
packet to IPv4 packet.
An unauthenticated attacker can continuously send crafted IPv6 packets through
the device causing repetitive MS-PIC process crashes, resulting in an extended
Denial of Service condition.
This issue affects Juniper Networks Junos OS on MX Series:
o 15.1 versions prior to 15.1R7-S7;
o 15.1X53 versions prior to 15.1X53-D593;
o 16.1 versions prior to 16.1R7-S8;
o 17.2 versions prior to 17.2R3-S4;
o 17.3 versions prior to 17.3R3-S6;
o 17.4 versions prior to 17.4R2-S11, 17.4R3;
o 18.1 versions prior to 18.1R3-S11;
o 18.2 versions prior to 18.2R3-S6;
o 18.2X75 versions prior to 18.2X75-D41, 18.2X75-D430, 18.2X75-D53,
18.2X75-D65;
o 18.3 versions prior to 18.3R2-S4, 18.3R3;
o 18.4 versions prior to 18.4R2-S5, 18.4R3;
o 19.1 versions prior to 19.1R2;
o 19.2 versions prior to 19.2R1-S5, 19.2R2;
o 19.3 versions prior to 19.3R2.
The example of the config stanza affected by this issue:
[services nat rule <rule_name> term <term_name> then translated
translation-type stateful-nat64]
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-2020-1680 .
Solution:
The following software releases have been updated to resolve this specific
issue: Junos OS 15.1R7-S7, 15.1X53-D593, 16.1R7-S8, 17.2R3-S4, 17.3R3-S6,
17.4R2-S11, 17.4R3, 18.1R3-S11, 18.2R3-S6, 18.2X75-D41, 18.2X75-D430,
18.2X75-D53, 18.2X75-D65, 18.3R2-S4, 18.3R3, 18.4R2-S5, 18.4R3, 19.1R2,
19.2R1-S5, 19.2R2, 19.3R2, 19.4R1, and all subsequent releases.
This issue is being tracked as 1441517 .
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:
5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
Severity Level:
Medium
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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