CVE-2018-0732

MEDIUM

Description

During key agreement in a TLS handshake using a DH(E) based ciphersuite a malicious server can send a very large prime value to the client. This will cause the client to spend an unreasonably long period of time generating a key for this prime resulting in a hang until the client has finished. This could be exploited in a Denial Of Service attack. Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h). Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2-1.0.2o).

References

http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html

http://www.securityfocus.com/bid/104442

http://www.securitytracker.com/id/1041090

https://access.redhat.com/errata/RHSA-2018:2552

https://access.redhat.com/errata/RHSA-2018:2553

https://access.redhat.com/errata/RHSA-2018:3221

https://access.redhat.com/errata/RHSA-2018:3505

https://access.redhat.com/errata/RHSA-2019:1296

https://access.redhat.com/errata/RHSA-2019:1297

https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=3984ef0b72831da8b3ece4745cac4f8575b19098

https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=ea7abeeabf92b7aca160bdd0208636d4da69f4f4

https://lists.debian.org/debian-lts-announce/2018/07/msg00043.html

https://nodejs.org/en/blog/vulnerability/august-2018-security-releases/

https://security.gentoo.org/glsa/201811-03

https://security.netapp.com/advisory/ntap-20181105-0001/

https://security.netapp.com/advisory/ntap-20190118-0002/

https://securityadvisories.paloaltonetworks.com/Home/Detail/133

https://usn.ubuntu.com/3692-1/

https://usn.ubuntu.com/3692-2/

https://www.debian.org/security/2018/dsa-4348

https://www.debian.org/security/2018/dsa-4355

https://www.openssl.org/news/secadv/20180612.txt

https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html

https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html

https://www.tenable.com/security/tns-2018-12

https://www.tenable.com/security/tns-2018-13

https://www.tenable.com/security/tns-2018-14

https://www.tenable.com/security/tns-2018-17

Details

Source: MITRE

Published: 2018-06-12

Updated: 2019-05-30

Type: CWE-320

Risk Information

CVSS v2.0

Base Score: 5

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Impact Score: 2.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3.0

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Impact Score: 3.6

Exploitability Score: 3.9

Severity: HIGH