Vulnerability CVE-2017-3738


Published: 2017-12-07

Description:
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.

Type:

CWE-200

(Information Exposure)

Vendor: Debian
Product: Debian linux 
Version: 9.0;
Vendor: Openssl
Product: Openssl 
Version:
1.1.0g
1.1.0f
1.1.0e
1.1.0d
1.1.0c
1.1.0b
1.1.0a
1.1.0
1.0.2m
1.0.2l
1.0.2k
1.0.2j
1.0.2i
1.0.2h
1.0.2g
1.0.2f
1.0.2e
1.0.2d
1.0.2c
1.0.2b
1.0.2a
1.0.2

CVSS2 => (AV:N/AC:M/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None

 References:
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
http://www.securityfocus.com/bid/102118
http://www.securitytracker.com/id/1039978
https://access.redhat.com/errata/RHSA-2018:0998
https://access.redhat.com/errata/RHSA-2018:2185
https://access.redhat.com/errata/RHSA-2018:2186
https://access.redhat.com/errata/RHSA-2018:2187
https://github.com/openssl/openssl/commit/e502cc86df9dafded1694fceb3228ee34d11c11a
https://nodejs.org/en/blog/vulnerability/december-2017-security-releases/
https://security.FreeBSD.org/advisories/FreeBSD-SA-17:12.openssl.asc
https://security.gentoo.org/glsa/201712-03
https://security.netapp.com/advisory/ntap-20171208-0001/
https://www.debian.org/security/2017/dsa-4065
https://www.debian.org/security/2018/dsa-4157
https://www.openssl.org/news/secadv/20171207.txt
https://www.openssl.org/news/secadv/20180327.txt
https://www.tenable.com/security/tns-2017-16
https://www.tenable.com/security/tns-2018-04
https://www.tenable.com/security/tns-2018-06
https://www.tenable.com/security/tns-2018-07

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