CVE-2018-0732

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

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://access.redhat.com/errata/RHSA-2019:1543

https://cert-portal.siemens.com/productcert/pdf/ssa-419820.pdf

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://lists.fedoraproject.org/archives/list/[email protected]/message/EWC42UXL5GHTU5G77VKBF6JYUUNGSHOM/

https://lists.fedoraproject.org/archives/list/[email protected]/message/Y3IVFGSERAZLNJCK35TEM2R4726XIH3Z/

https://lists.fedoraproject.org/archives/list/[email protected]/message/ZBEV5QGDRFUZDMNECFXUSN5FMYOZDE4V/

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

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

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

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

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/security-alerts/cpuapr2020.html

https://www.oracle.com/security-alerts/cpujan2021.html

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

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

https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html

https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.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

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

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

Details

Risk Information

CVSS v2

CVSS v3