CVE-2018-0732: Client DoS due to large DH parameter
First published: Tue Jun 12 2018(Updated: )
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).
Credit: openssl-security@openssl.org openssl-security@openssl.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| OpenSSL OpenSSL | >=1.0.2<=1.0.2o | |
| OpenSSL OpenSSL | >=1.1.0<=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 Debian Linux | =8.0 | |
| Nodejs Node.js | >=6.0.0<6.8.1 | |
| Nodejs Node.js | >=6.9.0<6.14.4 | |
| Nodejs Node.js | >=8.0.0<8.8.1 | |
| Nodejs Node.js | >=8.9.0<8.11.4 | |
| Nodejs Node.js | >=10.0.0<10.9.0 | |
| redhat/openssl | <1.1.0 | 1.1.0 |
| redhat/openssl | <1.0.2 | 1.0.2 |
| IBM Security Verify Governance | <=10.0 | |
| debian/openssl | 1.1.1w-0+deb11u1 1.1.1w-0+deb11u2 3.0.15-1~deb12u1 3.0.14-1~deb12u2 3.3.2-2 |
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Reference Links
- 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;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/package-announce@lists.fedoraproject.org/message/EWC42UXL5GHTU5G77VKBF6JYUUNGSHOM/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Y3IVFGSERAZLNJCK35TEM2R4726XIH3Z/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.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
- 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
- https://launchpad.net/bugs/cve/CVE-2018-0732
- 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.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://github.com/openssl/openssl/commit/ea7abeeabf92b7aca160bdd0208636d4da69f4f4
- https://github.com/openssl/openssl/commit/3984ef0b72831da8b3ece4745cac4f8575b19098
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1591102
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1591101
- https://access.redhat.com/support/policy/updates/jboss_notes
- https://bugzilla.redhat.com/show_bug.cgi?id=1591100
- https://exchange.xforce.ibmcloud.com/vulnerabilities/144658
- https://www.ibm.com/support/pages/node/7057377 (Advisory)
- https://git.openssl.org/?p=openssl.git;a=commit;h=ea7abeeabf92b7aca160bdd0208636d4da69f4f4
- https://git.openssl.org/?p=openssl.git;a=commit;h=3984ef0b72831da8b3ece4745cac4f8575b19098
- https://security-tracker.debian.org/tracker/CVE-2018-0732
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-0732
- https://nvd.nist.gov/vuln/detail/CVE-2018-0732
- https://ubuntu.com/security/CVE-2018-0732
Frequently Asked Questions
What is the vulnerability ID?
The vulnerability ID is CVE-2018-0732.
What is the severity of CVE-2018-0732?
The severity of CVE-2018-0732 is high with a severity value of 7.5.
What is the affected software?
The affected software includes OpenSSL versions 1.0.2 and 1.1.0, as well as various Ubuntu Linux and Debian versions.
How does CVE-2018-0732 work?
During a TLS handshake using a DH(E) based ciphersuite, a malicious server can send a very large prime value to the client, causing the client to spend an unreasonably long time generating a key for this prime and resulting in a hang.
Are there any available remedies for CVE-2018-0732?
Yes, there are available remedies provided by Red Hat, Canonical, Ubuntu, and Debian. Please refer to the respective sources for the specific versions and updates.
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