CVE-2018-0732
What it is
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).
At a glance
- Exploitability
- Can be exploited over the network without logging in. High risk of service disruption.
- Exploit odds
- 47.0% chance of exploitation in the next 30 days (EPSS). Higher than most.
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 47.0% in the next 30 days (EPSS).
- Severity: 7.5 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 47.0% · EPSS, next 30 days
- Weakness
- CWE-320
- Record status
- Modified
Affected
- OpenSSL ≤ 1.0.2o
- OpenSSL ≤ 1.1.0h
- Canonical Ubuntu Linux 12.04
- Canonical Ubuntu Linux 14.04
- Canonical Ubuntu Linux 16.04
- Canonical Ubuntu Linux 17.10
- Canonical Ubuntu Linux 18.04
- Debian Linux 8.0
Attack profile CVSS 3.1 · 7.5
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2018-0732.md and follow it. Check whether this project is affected by CVE-2018-0732. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- https://nodejs.org/en/blog/vulnerability/august-2018-security-releases/
- 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.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
- https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- https://nodejs.org/en/blog/vulnerability/august-2018-security-releases/
- https://www.openssl.org/news/secadv/20180612.txt
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://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%3Ba=commitdiff%3Bh=3984ef0b72831da8b3ece4745cac4f8575b19098
- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=ea7abeeabf92b7aca160bdd0208636d4da69f4f4
- https://lists.debian.org/debian-lts-announce/2018/07/msg00043.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EWC42UXL5GHTU5G77VKBF6JYUUNGSHOM/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3IVFGSERAZLNJCK35TEM2R4726XIH3Z/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZBEV5QGDRFUZDMNECFXUSN5FMYOZDE4V/
- 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