CVE-2020-24659: Null Pointer Dereference
First published: Fri Sep 04 2020(Updated: )
An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| GNU GnuTLS | <3.6.15 | |
| Fedoraproject Fedora | =32 | |
| Fedoraproject Fedora | =33 | |
| openSUSE Leap | =15.1 | |
| openSUSE Leap | =15.2 | |
| Canonical Ubuntu Linux | =20.04 | |
| IBM Cloud Pak for Security (CP4S) | <=1.5.0.0 | |
| IBM Cloud Pak for Security (CP4S) | <=1.5.1.0 | |
| IBM Cloud Pak for Security (CP4S) | <=1.6.0.0 | |
| IBM Cloud Pak for Security (CP4S) | <=1.6.1.0 | |
| IBM Cloud Pak for Security (CP4S) | <=1.7.0.0 | |
| IBM Cloud Pak for Security (CP4S) | <=1.7.1.0 | |
| debian/gnutls28 | 3.7.1-5+deb11u5 3.7.1-5+deb11u6 3.7.9-2+deb12u3 3.8.6-2 |
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Reference Links
- https://gitlab.com/gnutls/gnutls/-/issues/1071
- https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-09-04
- https://security.gentoo.org/glsa/202009-01
- https://security.netapp.com/advisory/ntap-20200911-0006/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/62BUAI4FQQLG6VTKRT7SUZPGJJ4NASQ3/
- https://usn.ubuntu.com/4491-1/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AWN56FDLQQXT2D2YHNI4TYH432TDMQ7N/
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00054.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00060.html
- https://launchpad.net/bugs/cve/CVE-2020-24659
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/62BUAI4FQQLG6VTKRT7SUZPGJJ4NASQ3/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AWN56FDLQQXT2D2YHNI4TYH432TDMQ7N/
- https://exchange.xforce.ibmcloud.com/vulnerabilities/187828
- https://www.ibm.com/support/pages/node/6476940 (Advisory)
- https://gitlab.com/gnutls/gnutls/-/commit/29ee67c205855e848a0a26e6d0e4f65b6b943e0a
- https://security-tracker.debian.org/tracker/CVE-2020-24659
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-24659
- https://nvd.nist.gov/vuln/detail/CVE-2020-24659
- https://ubuntu.com/security/CVE-2020-24659
Frequently Asked Questions
What is CVE-2020-24659?
CVE-2020-24659 is a vulnerability in GnuTLS that can be exploited to cause a denial of service.
How severe is CVE-2020-24659?
CVE-2020-24659 has a severity rating of 7.5 (high).
What is the affected software for CVE-2020-24659?
The affected software for CVE-2020-24659 includes GnuTLS versions up to and including 3.6.15, Ubuntu gnutls28 version 3.6.13-2ubuntu1.3, Fedora 32 and 33, openSUSE Leap 15.1 and 15.2, and Canonical Ubuntu Linux 20.04 LTS.
How do I fix CVE-2020-24659?
To fix CVE-2020-24659, update GnuTLS to version 3.6.15-1 or later.
Where can I find more information about CVE-2020-24659?
You can find more information about CVE-2020-24659 at the following references: [1], [2], [3].
- agent/type
- collector/launchpad-cve
- source/Launchpad
- agent/author
- agent/first-publish-date
- agent/remedy
- agent/severity
- agent/description
- agent/weakness
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- agent/software-canonical-lookup-request
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- source/IBM
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- source/MITRE
- agent/last-modified-date
- agent/references
- agent/event
- agent/tags
- collector/security-tracker-debian
- source/Debian
- agent/softwarecombine
- collector/usn-cve
- source/Ubuntu
- vendor/gnu
- canonical/gnu gnutls
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/32
- version/fedoraproject fedora/33
- vendor/opensuse
- canonical/opensuse leap
- version/opensuse leap/15.1
- version/opensuse leap/15.2
- vendor/canonical
- canonical/canonical ubuntu linux
- version/canonical ubuntu linux/20.04
- vendor/ibm
- canonical/ibm cloud pak for security (cp4s)
- version/ibm cloud pak for security (cp4s)/1.5.0.0
- version/ibm cloud pak for security (cp4s)/1.5.1.0
- version/ibm cloud pak for security (cp4s)/1.6.0.0
- version/ibm cloud pak for security (cp4s)/1.6.1.0
- version/ibm cloud pak for security (cp4s)/1.7.0.0
- version/ibm cloud pak for security (cp4s)/1.7.1.0
- package-manager/debian