// For flags

CVE-2018-0732

Client DoS due to large DH parameter

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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).

Durante los acuerdos de clave en un handshake TLS mediante un conjunto de cifrado basado en DH(E), un servidor malicioso puede enviar un valor primo muy grande al cliente. Esto provocará que el cliente gaste una cantidad de tiempo demasiado grande generando una clave para este primo, lo que resulta en un bloqueo hasta que termine el cliente. Esto podría explotarse en un ataque de Denegación de servicio (DoS). Se ha solucionado en OpenSSL 1.1.0i-dev (afecta a 1.1.0-1.1.0h). Se ha solucionado en OpenSSL 1.0.2p-dev (afecta a 1.0.2-1.0.2o).

*Credits: Guido Vranken
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2017-11-30 CVE Reserved
  • 2018-06-12 CVE Published
  • 2024-09-15 EPSS Updated
  • 2024-09-17 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-320: Key Management Errors
  • CWE-325: Missing Cryptographic Step
CAPEC
References (39)
URL Tag Source
http://www.securityfocus.com/bid/104442 Third Party Advisory
http://www.securitytracker.com/id/1041090 Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-419820.pdf Third Party Advisory
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=3984ef0b72831da8b3ece4745cac4f8575b19098 X_refsource_confirm
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=ea7abeeabf92b7aca160bdd0208636d4da69f4f4 X_refsource_confirm
https://lists.debian.org/debian-lts-announce/2018/07/msg00043.html Mailing List
https://security.netapp.com/advisory/ntap-20181105-0001 Third Party Advisory
https://security.netapp.com/advisory/ntap-20190118-0002 Third Party Advisory
https://securityadvisories.paloaltonetworks.com/Home/Detail/133 Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2020.html Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2021.html Third Party Advisory
https://www.tenable.com/security/tns-2018-12 Third Party Advisory
https://www.tenable.com/security/tns-2018-13 Third Party Advisory
https://www.tenable.com/security/tns-2018-14 Third Party Advisory
https://www.tenable.com/security/tns-2018-17 Third Party Advisory
URL Date SRC
URL Date SRC
http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html 2023-11-07
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html 2023-11-07
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html 2023-11-07
https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html 2023-11-07
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html 2023-11-07
URL Date SRC
https://access.redhat.com/errata/RHSA-2018:2552 2023-11-07
https://access.redhat.com/errata/RHSA-2018:2553 2023-11-07
https://access.redhat.com/errata/RHSA-2018:3221 2023-11-07
https://access.redhat.com/errata/RHSA-2018:3505 2023-11-07
https://access.redhat.com/errata/RHSA-2019:1296 2023-11-07
https://access.redhat.com/errata/RHSA-2019:1297 2023-11-07
https://access.redhat.com/errata/RHSA-2019:1543 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EWC42UXL5GHTU5G77VKBF6JYUUNGSHOM 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3IVFGSERAZLNJCK35TEM2R4726XIH3Z 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZBEV5QGDRFUZDMNECFXUSN5FMYOZDE4V 2023-11-07
https://nodejs.org/en/blog/vulnerability/august-2018-security-releases 2023-11-07
https://security.gentoo.org/glsa/201811-03 2023-11-07
https://usn.ubuntu.com/3692-1 2023-11-07
https://usn.ubuntu.com/3692-2 2023-11-07
https://www.debian.org/security/2018/dsa-4348 2023-11-07
https://www.debian.org/security/2018/dsa-4355 2023-11-07
https://www.openssl.org/news/secadv/20180612.txt 2023-11-07
https://access.redhat.com/security/cve/CVE-2018-0732 2019-06-18
https://bugzilla.redhat.com/show_bug.cgi?id=1591100 2019-06-18
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Openssl
Search vendor "Openssl"
 Openssl
Search vendor "Openssl" for product "Openssl"
 >= 1.0.2 <= 1.0.2o
Search vendor "Openssl" for product "Openssl" and version " >= 1.0.2 <= 1.0.2o"
-
Affected
Openssl
Search vendor "Openssl"
 Openssl
Search vendor "Openssl" for product "Openssl"
 >= 1.1.0 <= 1.1.0h
Search vendor "Openssl" for product "Openssl" and version " >= 1.1.0 <= 1.1.0h"
-
Affected
Canonical
Search vendor "Canonical"
 Ubuntu Linux
Search vendor "Canonical" for product "Ubuntu Linux"
 12.04
Search vendor "Canonical" for product "Ubuntu Linux" and version "12.04"
esm
Affected
Canonical
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 Ubuntu Linux
Search vendor "Canonical" for product "Ubuntu Linux"
 14.04
Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04"
lts
Affected
Canonical
Search vendor "Canonical"
 Ubuntu Linux
Search vendor "Canonical" for product "Ubuntu Linux"
 16.04
Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"
lts
Affected
Canonical
Search vendor "Canonical"
 Ubuntu Linux
Search vendor "Canonical" for product "Ubuntu Linux"
 17.10
Search vendor "Canonical" for product "Ubuntu Linux" and version "17.10"
-
Affected
Canonical
Search vendor "Canonical"
 Ubuntu Linux
Search vendor "Canonical" for product "Ubuntu Linux"
 18.04
Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04"
lts
Affected
Debian
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 Debian Linux
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 8.0
Search vendor "Debian" for product "Debian Linux" and version "8.0"
-
Affected
Nodejs
Search vendor "Nodejs"
 Node.js
Search vendor "Nodejs" for product "Node.js"
 >= 6.0.0 < 6.8.1
Search vendor "Nodejs" for product "Node.js" and version " >= 6.0.0 < 6.8.1"
-
Affected
Nodejs
Search vendor "Nodejs"
 Node.js
Search vendor "Nodejs" for product "Node.js"
 >= 6.9.0 < 6.14.4
Search vendor "Nodejs" for product "Node.js" and version " >= 6.9.0 < 6.14.4"
lts
Affected
Nodejs
Search vendor "Nodejs"
 Node.js
Search vendor "Nodejs" for product "Node.js"
 >= 8.0.0 < 8.8.1
Search vendor "Nodejs" for product "Node.js" and version " >= 8.0.0 < 8.8.1"
-
Affected
Nodejs
Search vendor "Nodejs"
 Node.js
Search vendor "Nodejs" for product "Node.js"
 >= 8.9.0 < 8.11.4
Search vendor "Nodejs" for product "Node.js" and version " >= 8.9.0 < 8.11.4"
lts
Affected
Nodejs
Search vendor "Nodejs"
 Node.js
Search vendor "Nodejs" for product "Node.js"
 >= 10.0.0 < 10.9.0
Search vendor "Nodejs" for product "Node.js" and version " >= 10.0.0 < 10.9.0"
-
Affected