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Category:   Application (VPN)  >   OpenSSL Vendors:
(Oracle Issues Fix for Oracle Linux) OpenSSL Bugs Let Users Deny Service and Bypass Authentication in Certain Cases
SecurityTracker Alert ID:  1042069
SecurityTracker URL:
CVE Reference:   CVE-2018-0739   (Links to External Site)
Date:  Nov 12 2018
Impact:   Denial of service via network, Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Two vulnerabilities were reported in OpenSSL. A user can cause denial of service conditions on the target system. A user can bypass authentication in certain cases.

A user can create specially crafted ASN.1 data with a recursive definition that, when processed by the target application using the OpenSSL library, will consume excessive stack memory [CVE-2018-0739]. SSL/TLS is not an attack vector.

The PA-RISC CRYPTO_memcmp() function used on HP-UX PA-RISC targets does not properly compare byte values [CVE-2018-0733]. As a result, a user can create forged messages, some of which may be authenticated. The vulnerable module is only compiled by the HP-UX assembler. Version 1.1.0 is affected.

Peter Waltenberg (IBM) reported the CRYPTO_memcmp() vulnerability.

Impact:   A user can cause denial of service conditions.

A user can bypass authentication on the target system in certain cases.

Solution:   Oracle has issued a fix for CVE-2018-0739.

The Oracle Linux advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Access control error, Authentication error
Underlying OS:  Linux (Oracle)
Underlying OS Comments:  7

Message History:   This archive entry is a follow-up to the message listed below.
Mar 27 2018 OpenSSL Bugs Let Users Deny Service and Bypass Authentication in Certain Cases

 Source Message Contents

Subject:  [El-errata] ELSA-2018-3221 Moderate: Oracle Linux 7 openssl security, bug fix, and enhancement update

Oracle Linux Security Advisory ELSA-2018-3221

The following updated rpms for Oracle Linux 7 have been uploaded to the 
Unbreakable Linux Network:



Description of changes:

- sha256 is used for the RSA pairwise consistency test instead of sha1

- fix CVE-2018-0495 - ROHNP - Key Extraction Side Channel on DSA, ECDSA
- fix incorrect error message on FIPS DSA parameter generation (#1603597)

- ppc64le is not multilib architecture (#1585004)

- add S390x assembler updates
- make CA name list comparison function case sensitive (#1548401)
- fix CVE-2017-3735 - possible one byte overread with X.509 IPAdressFamily
- fix CVE-2018-0732 - large prime DH DoS of TLS client
- fix CVE-2018-0737 - RSA key generation cache timing vulnerability
- fix CVE-2018-0739 - stack overflow parsing recursive ASN.1 structure

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