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CVE-2018-0732

Client DoS due to large DH parameter

Published: Jun 12, 2018Updated: Nov 21, 2024 Sources: CVE List NVD BDU csafCWE-320
NVD MITRE
7.5CVSSHIGH
EPSS Score
49.3%
Top 1.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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).

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-320

Affected Products

OpenSSLOpenSSLOSS Libraries
opensslopensslOSS Libraries
ubuntu linuxcanonical
On-premOS
Operating Systems / linux-distro
debian linuxdebian
On-premOS
Operating Systems / linux-distro
node.jsnodejsOSS Libraries
openssloss-projectUSOSS Librariesaka open ssl
canonicalcommercialGBOperating Systemsaka canonical ltd.
debianoss-projectGBOperating Systemsaka debian gnu/linux
nodejsoss-projectUSOSS Librariesaka node.js, node
and 54 more affected products View all →

Exploitability

Official Patch Available

References

https://lists.debian.org/debian-lts-announce/2018/07/msg00043.html
lists.debian.org
http://www.securityfocus.com/bid/104442
securityfocus.com
https://www.debian.org/security/2018/dsa-4355
debian.org
and 61 more references View all →

Timeline

Published
Jun 12, 2018
Last Updated
Nov 21, 2024

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