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AUSCERT External Security Bulletin Redistribution
ESB-2020.2346
Junos OS: RPD crash when executing specific "show ospf interface" commands
from the CLI with OSPF authentication configured (CVE-2020-1643)
9 July 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Junos OS
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-1643
Original Bulletin:
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11030
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2020-07 Security Bulletin: Junos OS: RPD crash when executing specific "show ospf interface" commands from the CLI with OSPF authentication configured (CVE-2020-1643)
Article ID : JSA11030
Last Updated: 08 Jul 2020
Version : 1.0
Product Affected:
This issue affects Junos OS 12.3X48, 14.1X53, 15.1, 15.1X49, 15.1X53, 16.1,
17.1, 17.2, 17.3, 17.4, 18.1, 18.2, 18.2X75, 18.3.
Problem:
Execution of the " show ospf interface extensive " or " show ospf interface
detail " CLI commands on a Juniper Networks device running Junos OS may cause
the routing protocols process (RPD) to crash and restart if OSPF interface
authentication is configured, leading to a Denial of Service (DoS). By
continuously executing the same CLI commands, a local attacker can repeatedly
crash the RPD process causing a sustained Denial of Service.
This issue affects Juniper Networks Junos OS:
o 12.3X48 versions prior to 12.3X48-D100;
o 14.1X53 versions prior to 14.1X53-D140, 14.1X53-D54;
o 15.1 versions prior to 15.1R7-S7;
o 15.1X49 versions prior to 15.1X49-D210;
o 15.1X53 versions prior to 15.1X53-D593;
o 16.1 versions prior to 16.1R7-S8;
o 17.1 versions prior to 17.1R2-S12;
o 17.2 versions prior to 17.2R3-S4;
o 17.3 versions prior to 17.3R3-S8;
o 17.4 versions prior to 17.4R2-S2, 17.4R3;
o 18.1 versions prior to 18.1R3-S2;
o 18.2 versions prior to 18.2R2, 18.2R3;
o 18.2X75 versions prior to 18.2X75-D40;
o 18.3 versions prior to 18.3R1-S2, 18.3R2.
An example of a vulnerable configuration with OSPF authentication enabled is
shown below:
area 0.0.0.0 {
interface ae0.0 {
authentication {
md5 0 key "$9$XyZzYxYzZyXyZzYxYzZy"; ## SECRET-DATA
}
}
}
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-2020-1643 .
Solution:
The following software releases have been updated to resolve this specific
issue: Junos OS 12.3X48-D100, 14.1X53-D140, 14.1X53-D54, 15.1R7-S7,
15.1X49-D210, 15.1X53-D593, 16.1R7-S8, 17.1R2-S12, 17.2R3-S4, 17.3R3-S8,
17.4R2-S2, 17.4R3, 18.1R3-S2, 18.2R2, 18.2X75-D40, 18.3R1-S2, 18.3R2, 18.4R1,
and all subsequent releases.
This issue is being tracked as 1385014 .
Workaround:
Limit access to the Junos CLI and shell to only trusted administrators.
Restrict access to " show ospf interface extensive " or " show ospf interface
detail " via command authorization until an upgrade can be performed.
Implementation:
Software releases or updates are available for download at https://
www.juniper.net/support/downloads/ .
Modification History:
2020-07-08: Initial publication
CVSS Score:
5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
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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