The Montgomery squaring implementation in crypto/bn/asm/x86_64-mont5.pl in OpenSSL 1.0.2 before 1.0.2e on the x86_64 platform, as used by the BN_mod_exp function, mishandles carry propagation and produces incorrect output, which makes it easier for remote attackers to obtain sensitive private-key information via an attack against use of a (1) Diffie-Hellman (DH) or (2) Diffie-Hellman Ephemeral (DHE) ciphersuite.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2015-3193 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue does not affect the version of OpenSSL as shipped with Red Hat Enterprise Linux 5, 6 and 7.
NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.
| Base Score | 2.6 |
|---|---|
| Base Metrics | AV:N/AC:H/Au:N/C:P/I:N/A:N |
| Access Vector | Network |
| Access Complexity | High |
| Authentication | None |
| Confidentiality Impact | Partial |
| Integrity Impact | None |
| Availability Impact | None |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Package | State |
|---|---|---|
| Red Hat JBoss Web Server 3.0 | openssl | Not affected |
| Red Hat JBoss EWS 2 | openssl | Not affected |
| Red Hat JBoss EWS 1 | openssl | Not affected |
| Red Hat JBoss EAP 6 | openssl | Not affected |
| Red Hat Enterprise Linux 7 | openssl098e | Not affected |
| Red Hat Enterprise Linux 7 | openssl | Not affected |
| Red Hat Enterprise Linux 6 | openssl | Not affected |
| Red Hat Enterprise Linux 5 | openssl | Not affected |
| Red Hat Enterprise Linux 5 | openssl097a | Not affected |
Vulmon