CVE-2020-24659
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Gnutls
PublishedSep 4, 2020
First seenSep 4, 2020
How to fix
Update
- gnu gnutls3.6.15 or later
Vendor advisories
- security.gentoo.org/glsa/202009-01
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/62BUAI4FQQLG6VTKRT7SUZPGJJ4NASQ3/
- usn.ubuntu.com/4491-1/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AWN56FDLQQXT2D2YHNI4TYH432TDMQ7N/
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| gnu gnutls | v < 3.6.15 | 3.6.15 |
| fedoraproject fedora | 32, 33 | — |
| opensuse leap | 15.1, 15.2 | — |
| canonical ubuntu_linux | 20.04 | — |
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