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Category:   Application (VPN)  >   OpenSSL Vendors:   OpenSSL.org
(Red Hat Issues Fix) OpenSSL RSA Key Generation BN_mod_inverse() and BN_mod_exp_mont() Cache Timing Attack Lets Local Users Recover the Private Key
SecurityTracker Alert ID:  1041996
SecurityTracker URL:  http://securitytracker.com/id/1041996
CVE Reference:   CVE-2018-0737   (Links to External Site)
Date:  Oct 30 2018
Impact:   Disclosure of authentication information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in OpenSSL. A local user can recover the private key in certain cases.

A local user that can conduct a cache timing side channel attack against the RSA key generation algorithm's BN_mod_inverse() and BN_mod_exp_mont() functions may be able to recover the private key.

The vendor was notified on April 4, 2018.

Alejandro Cabrera Aldaya, Billy Brumley, Cesar Pereida Garcia, and Luis Manuel Alvarez Tapia reported this vulnerability.

Impact:   A local user that can conduct a cache timing attack on the target system may be able to recover the private key in certain cases.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2018:3221

Vendor URL:  access.redhat.com/errata/RHSA-2018:3221 (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  7

Message History:   This archive entry is a follow-up to the message listed below.
Apr 16 2018 OpenSSL RSA Key Generation BN_mod_inverse() and BN_mod_exp_mont() Cache Timing Attack Lets Local Users Recover the Private Key



 Source Message Contents

Subject:  [RHSA-2018:3221-01] Moderate: openssl security, bug fix, and enhancement update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: openssl security, bug fix, and enhancement update
Advisory ID:       RHSA-2018:3221-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:3221
Issue date:        2018-10-30
CVE Names:         CVE-2017-3735 CVE-2018-0495 CVE-2018-0732 
                   CVE-2018-0737 CVE-2018-0739 
=====================================================================

1. Summary:

An update for openssl is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, ppc64le, s390x
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) - aarch64, ppc64le, s390x

3. Description:

OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL) and
Transport Layer Security (TLS) protocols, as well as a full-strength
general-purpose cryptography library.

Security Fix(es):

* openssl: ROHNP - Key Extraction Side Channel in Multiple Crypto Libraries
(CVE-2018-0495)

* openssl: Malicious server can send large prime to client during DH(E) TLS
handshake causing the client to hang (CVE-2018-0732)

* openssl: Handling of crafted recursive ASN.1 structures can cause a stack
overflow and resulting denial of service (CVE-2018-0739)

* openssl: Malformed X.509 IPAdressFamily could cause OOB read
(CVE-2017-3735)

* openssl: RSA key generation cache timing vulnerability in
crypto/rsa/rsa_gen.c allows attackers to recover private keys
(CVE-2018-0737)

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.6 Release Notes linked from the References section.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

For the update to take effect, all services linked to the OpenSSL library
must be restarted, or the system rebooted.

5. Bugs fixed (https://bugzilla.redhat.com/):

1486144 - CVE-2017-3735 openssl: Malformed X.509 IPAdressFamily could cause OOB read
1548401 - modify X509_NAME comparison function to be case sensitive for CA name lists in SSL
1561266 - CVE-2018-0739 openssl: Handling of crafted recursive ASN.1 structures can cause a stack overflow and resulting denial of service
1568253 - CVE-2018-0737 openssl: RSA key generation cache timing vulnerability in crypto/rsa/rsa_gen.c allows attackers to recover private keys
1585004 - ppc64le opensslconf.h is incompatible with swig
1591100 - CVE-2018-0732 openssl: Malicious server can send large prime to client during DH(E) TLS handshake causing the client to hang
1591163 - CVE-2018-0495 openssl: ROHNP - Key Extraction Side Channel in Multiple Crypto Libraries
1603597 - Confusing error message when asking for invalid DSA parameter sizes in FIPS mode

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
openssl-1.0.2k-16.el7.src.rpm

x86_64:
openssl-1.0.2k-16.el7.x86_64.rpm
openssl-debuginfo-1.0.2k-16.el7.i686.rpm
openssl-debuginfo-1.0.2k-16.el7.x86_64.rpm
openssl-libs-1.0.2k-16.el7.i686.rpm
openssl-libs-1.0.2k-16.el7.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
openssl-debuginfo-1.0.2k-16.el7.i686.rpm
openssl-debuginfo-1.0.2k-16.el7.x86_64.rpm
openssl-devel-1.0.2k-16.el7.i686.rpm
openssl-devel-1.0.2k-16.el7.x86_64.rpm
openssl-perl-1.0.2k-16.el7.x86_64.rpm
openssl-static-1.0.2k-16.el7.i686.rpm
openssl-static-1.0.2k-16.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
openssl-1.0.2k-16.el7.src.rpm

x86_64:
openssl-1.0.2k-16.el7.x86_64.rpm
openssl-debuginfo-1.0.2k-16.el7.i686.rpm
openssl-debuginfo-1.0.2k-16.el7.x86_64.rpm
openssl-libs-1.0.2k-16.el7.i686.rpm
openssl-libs-1.0.2k-16.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
openssl-debuginfo-1.0.2k-16.el7.i686.rpm
openssl-debuginfo-1.0.2k-16.el7.x86_64.rpm
openssl-devel-1.0.2k-16.el7.i686.rpm
openssl-devel-1.0.2k-16.el7.x86_64.rpm
openssl-perl-1.0.2k-16.el7.x86_64.rpm
openssl-static-1.0.2k-16.el7.i686.rpm
openssl-static-1.0.2k-16.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
openssl-1.0.2k-16.el7.src.rpm

ppc64:
openssl-1.0.2k-16.el7.ppc64.rpm
openssl-debuginfo-1.0.2k-16.el7.ppc.rpm
openssl-debuginfo-1.0.2k-16.el7.ppc64.rpm
openssl-devel-1.0.2k-16.el7.ppc.rpm
openssl-devel-1.0.2k-16.el7.ppc64.rpm
openssl-libs-1.0.2k-16.el7.ppc.rpm
openssl-libs-1.0.2k-16.el7.ppc64.rpm

ppc64le:
openssl-1.0.2k-16.el7.ppc64le.rpm
openssl-debuginfo-1.0.2k-16.el7.ppc64le.rpm
openssl-devel-1.0.2k-16.el7.ppc64le.rpm
openssl-libs-1.0.2k-16.el7.ppc64le.rpm

s390x:
openssl-1.0.2k-16.el7.s390x.rpm
openssl-debuginfo-1.0.2k-16.el7.s390.rpm
openssl-debuginfo-1.0.2k-16.el7.s390x.rpm
openssl-devel-1.0.2k-16.el7.s390.rpm
openssl-devel-1.0.2k-16.el7.s390x.rpm
openssl-libs-1.0.2k-16.el7.s390.rpm
openssl-libs-1.0.2k-16.el7.s390x.rpm

x86_64:
openssl-1.0.2k-16.el7.x86_64.rpm
openssl-debuginfo-1.0.2k-16.el7.i686.rpm
openssl-debuginfo-1.0.2k-16.el7.x86_64.rpm
openssl-devel-1.0.2k-16.el7.i686.rpm
openssl-devel-1.0.2k-16.el7.x86_64.rpm
openssl-libs-1.0.2k-16.el7.i686.rpm
openssl-libs-1.0.2k-16.el7.x86_64.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):

Source:
openssl-1.0.2k-16.el7.src.rpm

aarch64:
openssl-1.0.2k-16.el7.aarch64.rpm
openssl-debuginfo-1.0.2k-16.el7.aarch64.rpm
openssl-devel-1.0.2k-16.el7.aarch64.rpm
openssl-libs-1.0.2k-16.el7.aarch64.rpm

ppc64le:
openssl-1.0.2k-16.el7.ppc64le.rpm
openssl-debuginfo-1.0.2k-16.el7.ppc64le.rpm
openssl-devel-1.0.2k-16.el7.ppc64le.rpm
openssl-libs-1.0.2k-16.el7.ppc64le.rpm

s390x:
openssl-1.0.2k-16.el7.s390x.rpm
openssl-debuginfo-1.0.2k-16.el7.s390.rpm
openssl-debuginfo-1.0.2k-16.el7.s390x.rpm
openssl-devel-1.0.2k-16.el7.s390.rpm
openssl-devel-1.0.2k-16.el7.s390x.rpm
openssl-libs-1.0.2k-16.el7.s390.rpm
openssl-libs-1.0.2k-16.el7.s390x.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7):

aarch64:
openssl-debuginfo-1.0.2k-16.el7.aarch64.rpm
openssl-perl-1.0.2k-16.el7.aarch64.rpm
openssl-static-1.0.2k-16.el7.aarch64.rpm

ppc64le:
openssl-debuginfo-1.0.2k-16.el7.ppc64le.rpm
openssl-perl-1.0.2k-16.el7.ppc64le.rpm
openssl-static-1.0.2k-16.el7.ppc64le.rpm

s390x:
openssl-debuginfo-1.0.2k-16.el7.s390.rpm
openssl-debuginfo-1.0.2k-16.el7.s390x.rpm
openssl-perl-1.0.2k-16.el7.s390x.rpm
openssl-static-1.0.2k-16.el7.s390.rpm
openssl-static-1.0.2k-16.el7.s390x.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64:
openssl-debuginfo-1.0.2k-16.el7.ppc.rpm
openssl-debuginfo-1.0.2k-16.el7.ppc64.rpm
openssl-perl-1.0.2k-16.el7.ppc64.rpm
openssl-static-1.0.2k-16.el7.ppc.rpm
openssl-static-1.0.2k-16.el7.ppc64.rpm

ppc64le:
openssl-debuginfo-1.0.2k-16.el7.ppc64le.rpm
openssl-perl-1.0.2k-16.el7.ppc64le.rpm
openssl-static-1.0.2k-16.el7.ppc64le.rpm

s390x:
openssl-debuginfo-1.0.2k-16.el7.s390.rpm
openssl-debuginfo-1.0.2k-16.el7.s390x.rpm
openssl-perl-1.0.2k-16.el7.s390x.rpm
openssl-static-1.0.2k-16.el7.s390.rpm
openssl-static-1.0.2k-16.el7.s390x.rpm

x86_64:
openssl-debuginfo-1.0.2k-16.el7.i686.rpm
openssl-debuginfo-1.0.2k-16.el7.x86_64.rpm
openssl-perl-1.0.2k-16.el7.x86_64.rpm
openssl-static-1.0.2k-16.el7.i686.rpm
openssl-static-1.0.2k-16.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
openssl-1.0.2k-16.el7.src.rpm

x86_64:
openssl-1.0.2k-16.el7.x86_64.rpm
openssl-debuginfo-1.0.2k-16.el7.i686.rpm
openssl-debuginfo-1.0.2k-16.el7.x86_64.rpm
openssl-devel-1.0.2k-16.el7.i686.rpm
openssl-devel-1.0.2k-16.el7.x86_64.rpm
openssl-libs-1.0.2k-16.el7.i686.rpm
openssl-libs-1.0.2k-16.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
openssl-debuginfo-1.0.2k-16.el7.i686.rpm
openssl-debuginfo-1.0.2k-16.el7.x86_64.rpm
openssl-perl-1.0.2k-16.el7.x86_64.rpm
openssl-static-1.0.2k-16.el7.i686.rpm
openssl-static-1.0.2k-16.el7.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2017-3735
https://access.redhat.com/security/cve/CVE-2018-0495
https://access.redhat.com/security/cve/CVE-2018-0732
https://access.redhat.com/security/cve/CVE-2018-0737
https://access.redhat.com/security/cve/CVE-2018-0739
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.6_release_notes/index

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2018 Red Hat, Inc.
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