CVE-2017-3738
4.3 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:N/A:N
5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
6.1 Medium
AI Score
Confidence
High
0.119 Low
EPSS
Percentile
95.4%
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.
Affected configurations
References
www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
www.securityfocus.com/bid/102118
www.securitytracker.com/id/1039978
access.redhat.com/errata/RHSA-2018:0998
access.redhat.com/errata/RHSA-2018:2185
access.redhat.com/errata/RHSA-2018:2186
access.redhat.com/errata/RHSA-2018:2187
github.com/openssl/openssl/commit/e502cc86df9dafded1694fceb3228ee34d11c11a
nodejs.org/en/blog/vulnerability/december-2017-security-releases/
security.FreeBSD.org/advisories/FreeBSD-SA-17:12.openssl.asc
security.gentoo.org/glsa/201712-03
security.netapp.com/advisory/ntap-20171208-0001/
support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbst03881en_us
www.debian.org/security/2017/dsa-4065
www.debian.org/security/2018/dsa-4157
www.openssl.org/news/secadv/20171207.txt
www.openssl.org/news/secadv/20180327.txt
www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
www.tenable.com/security/tns-2017-16
www.tenable.com/security/tns-2018-04
www.tenable.com/security/tns-2018-06
www.tenable.com/security/tns-2018-07
Related
4.3 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:N/A:N
5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
6.1 Medium
AI Score
Confidence
High
0.119 Low
EPSS
Percentile
95.4%