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AUSCERT External Security Bulletin Redistribution
Junos OS and Junos OS Evolved: OpenSSL Security Advisory [20 Dec 2019]
9 July 2020
AusCERT Security Bulletin Summary
Product: Junos OS
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2019-1551
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2020-07 Security Bulletin: Junos OS and Junos OS Evolved: OpenSSL Security Advisory [20 Dec 2019]
Article ID : JSA11025
Last Updated: 08 Jul 2020
Version : 1.0
This issue affects Junos OS 15.1, 15.1X49, 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, 19.4. This issue affects
Junos OS Evolved 19.1, 19.2, 19.3, 19.4.
The OpenSSL project has published a security advisory for a vulnerability
resolved in the OpenSSL library on December 20, 2019.
This issue affects:
Juniper Networks Junos OS:
o 15.1 versions prior to 15.1R7-S7;
o 15.1X49 versions prior to 15.1X49-D230;
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-S8;
o 17.4 versions prior to 17.4R2-S10, 17.4R3-S1;
o 18.1 versions prior to 18.1R3-S10;
o 18.2 versions prior to 18.2R2-S7, 18.2R3-S4;
o 18.2X75 versions prior to 18.2X75-D60;
o 18.3 versions prior to 18.3R1-S7, 18.3R2-S4, 18.3R3-S2;
o 18.4 versions prior to 18.4R2-S4, 18.4R3-S1;
o 19.1 versions prior to 19.1R1-S5, 19.1R2-S1, 19.1R3;
o 19.2 versions prior to 19.2R1-S4, 19.2R2;
o 19.3 versions prior to 19.3R2-S2, 19.3R3;
o 19.4 versions prior to 19.4R1-S1, 19.4R2.
Juniper Networks Junos OS Evolved:
o 19.1 versions prior to 19.1R3-EVO
o 19.2 versions prior to 19.2R2-EVO;
o 19.3 versions prior to 19.3R3-EVO;
o 19.4 versions prior to 19.4R2-EVO.
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was discovered during an external security research.
The important security issue resolved is described below:
CVE CVSS Summary
There is an overflow bug in the x64_64 Montgomery squaring
procedure used in exponentiation with 512-bit moduli. No EC
algorithms are affected. Analysis suggests that attacks
against 2-prime RSA1024, 3-prime RSA1536, and DSA1024 as a
result of this defect would be very difficult to perform and
are not believed likely. Attacks against DH512 are
CVE-2019-1551 5.3 considered just feasible. However, for an attack the target
would have to re-use the DH512 private key, which is not
recommended anyway. Also applications directly using the low
level API BN_mod_exp may be affected if they use
BN_FLG_CONSTTIME. Fixed in OpenSSL 1.1.1e (Affected
1.1.1-1.1.1d). Fixed in OpenSSL 1.0.2u (Affected
The following software releases have been updated to resolve this specific
Junos OS: 15.1R7-S7, 15.1X49-D230, 15.1X53-D593, 16.1R7-S8, 17.2R3-S4,
17.3R3-S8, 17.4R2-S10, 17.4R3-S1, 18.1R3-S10, 18.2R2-S7, 18.2R3-S4,
18.2X75-D60, 18.3R1-S7, 18.3R2-S4, 18.3R3-S2, 18.4R2-S4, 18.4R3-S1, 19.1R1-S5,
19.1R2-S1, 19.1R3, 19.2R1-S4, 19.2R2, 19.3R2-S2, 19.3R3, 19.4R1-S1, 19.4R2,
20.1R1, and all subsequent releases.
Junos OS Evolved: 19.1R3-EVO,19.2R2-EVO, 19.3R3-EVO, 19.4R2-EVO, 20.1R1-EVO,
and all subsequent releases.
This issue is being tracked as 1479780 and 1485711 .
Since SSL is used for remote network configuration and management applications
such as J-Web and SSL Service for JUNOScript (XNM-SSL), viable workarounds for
this issue in Junos may include:
o Disabling J-Web
o Disable SSL service for JUNOScript and only use Netconf, which makes use of
SSH, to make configuration changes
o Limit access to J-Web and XNM-SSL from only trusted networks
In addition to the recommendations listed above, 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 router
via SSL only from trusted, administrative networks or hosts.
Software Releases, patches and updates are available at https://www.juniper.net
2020-07-08: Initial Publication
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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