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Category:   Device (Router/Bridge/Hub)  >   Juniper Junos Vendors:   Juniper
(Juniper Issues Fix for Juniper Junos) OpenSSL Overflow in rsaz_1024_mul_avx2() Lets Remote Users Obtain Potentially Sensitive Information in Certain Cases and SSL_read()/SSL_write() Error State Bug May Bypass Decryption/Encryption in Certain Application Dependent Cases
SecurityTracker Alert ID:  1040781
SecurityTracker URL:  http://securitytracker.com/id/1040781
CVE Reference:   CVE-2017-3737, CVE-2017-3738   (Links to External Site)
Date:  Apr 28 2018
Impact:   Disclosure of authentication information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Two vulnerabilities were reported in OpenSSL. A remote user can obtain potentially sensitive information on the target system in certain cases. A remote user may be able to cause an application to bypass decryption/encryption in certain limited cases. Juniper Junos is affected.

A remote user can exploit an overflow bug in the AVX2 Montgomery multiplication procedure used in exponentiation with 1024-bit moduli to potentially determine information about the private key in certain situations [CVE-2017-3738].

Processors that support the AVX2 but not ADX extensions (e.g., Intel Haswell (4th generation)) are affected.

Attacks against DH1024 may be feasible.

EC algorithms are not affected.

A remote user can invoke a handshake failure to trigger a bug in OpenSSL error handling code for applications that directly make an SSL_read() or SSL_write() call for an SSL object after receiving a fatal error, causing data to bypass the decryption or encryption process [CVE-2017-3737]. Versions 1.0.2b and after are affected.

David Benjamin (Google) reported these vulnerabilities.

Impact:   A remote user can potentially determine information about the private key in certain situations.

A remote user may be able to cause an application to bypass decryption/encryption in certain limited cases.

Solution:   The Juniper has issued a fix for JunOS (12.3X48-D70, 14.1R9, 14.1X53-D130, 14.1X53-D47, 15.1R6-S6, 15.1R7, 15.1X49-D130, 15.1X53-D233, 15.1X53-D471, 15.1X53-D59, 15.1X53-D67, 16.1R3-S8, 16.1R5-S4, 16.1R6-S3, 16.2R1-S6, 16.2R2-S5, 17.1R2-S6, 17.2R2-S3, 17.3R3, 17.4R2, 18.1R1).

The Juniper advisory is available at:

https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10851

Vendor URL:  kb.juniper.net/InfoCenter/index?page=content&id=JSA10851 (Links to External Site)
Cause:   Boundary error, State error

Message History:   This archive entry is a follow-up to the message listed below.
Dec 7 2017 OpenSSL Overflow in rsaz_1024_mul_avx2() Lets Remote Users Obtain Potentially Sensitive Information in Certain Cases and SSL_read()/SSL_write() Error State Bug May Bypass Decryption/Encryption in Certain Application Dependent Cases



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