Juniper Junos OpenSSL Security Advisory (JSA11025)

Medium Nessus Plugin ID 138909


The remote device is missing a vendor-supplied security patch.


According to its self-reported version, the remote Juniper Junos device is affected by a vulnerability in the OpenSSL library. 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 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.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Apply the relevant Junos software release referenced in Juniper advisory JSA11025

See Also

Plugin Details

Severity: Medium

ID: 138909

File Name: juniper_jsa11025.nasl

Version: 1.1

Type: combined

Published: 2020/07/24

Updated: 2020/07/24

Dependencies: 55932

Risk Information

Risk Factor: Medium

CVSS Score Source: CVE-2019-1551

CVSS v2.0

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS v3.0

Base Score: 5.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Vulnerability Information

CPE: cpe:/o:juniper:junos

Required KB Items: Host/Juniper/JUNOS/Version

Patch Publication Date: 2020/07/08

Vulnerability Publication Date: 2019/12/06

Reference Information

CVE: CVE-2019-1551

JSA: JSA11025