There is an overflow bug in the AVX2 Montgomery multiplication procedure used in exponentiation with 1024-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH1024 are considered just feasible, because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be significant. However, for an attack on TLS to be meaningful, the server would have to share the DH1024 private key among multiple clients, which is no longer an option since CVE-2016-0701. This only affects processors that support the AVX2 but not ADX extensions like Intel Haswell (4th generation). Note: The impact from this issue is similar to CVE-2017-3736, CVE-2017-3732 and CVE-2015-3193. OpenSSL version 1.0.2-1.0.2m and 1.1.0-1.1.0g are affected. Fixed in OpenSSL 1.0.2n. Due to the low severity of this issue we are not issuing a new release of OpenSSL 1.1.0 at this time. The fix will be included in OpenSSL 1.1.0h when it becomes available. The fix is also available in commit e502cc86d in the OpenSSL git repository.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2017-3738 from the MITRE CVE dictionary dictionary and NIST NVD.
CVSS3 Base Score | 5.9 |
---|---|
CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
Attack Vector | Network |
Attack Complexity | High |
Privileges Required | None |
User Interaction | None |
Scope | Unchanged |
Confidentiality | High |
Integrity Impact | None |
Availability Impact | None |
Platform | Errata | Release Date |
---|---|---|
Red Hat JBoss Core Services on RHEL 7 Server | RHSA-2018:2185 | 2018-07-12 |
Red Hat Enterprise Linux 7 (openssl) | RHSA-2018:0998 | 2018-04-10 |
Red Hat JBoss Core Services 1 | RHSA-2018:2187 | 2018-07-12 |
Red Hat JBoss Core Services on RHEL 6 Server | RHSA-2018:2186 | 2018-07-12 |
Platform | Package | State |
---|---|---|
Red Hat JBoss Web Server 3.0 | openssl | Will not fix |
Red Hat JBoss Web Server 3 | openssl | Affected |
Red Hat JBoss EWS 2 | openssl | Will not fix |
Red Hat JBoss EAP 6 | openssl | Will not fix |
Red Hat JBoss EAP 5 | openssl | Under investigation |
Red Hat Enterprise Linux 7 | openssl098e | Not affected |
Red Hat Enterprise Linux 7 | OVMF | Not affected |
Red Hat Enterprise Linux 6 | openssl | Not affected |
Red Hat Enterprise Linux 6 | openssl098e | Not affected |
Red Hat Enterprise Linux 5 | openssl097a | Not affected |
Red Hat Enterprise Linux 5 | openssl | Not affected |
RHEV Manager 3 | mingw-virt-viewer | Not affected |