CVE-2023-5981: Gnutls: timing side-channel in the rsa-psk authentication
First published: Tue Nov 07 2023(Updated: )
A vulnerability was found that the response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/GnuTLS | <3.8.2 | 3.8.2 |
| Gnu Gnutls | =1.5.0 | |
| Redhat Linux | =8.0 | |
| Redhat Linux | =9.0 | |
| Fedoraproject Fedora | =37 | |
| Fedoraproject Fedora | =38 | |
| ubuntu/gnutls28 | <3.5.18-1ubuntu1.6+ | 3.5.18-1ubuntu1.6+ |
| ubuntu/gnutls28 | <3.6.13-2ubuntu1.9 | 3.6.13-2ubuntu1.9 |
| ubuntu/gnutls28 | <3.7.3-4ubuntu1.3 | 3.7.3-4ubuntu1.3 |
| ubuntu/gnutls28 | <3.7.8-5ubuntu1.1 | 3.7.8-5ubuntu1.1 |
| ubuntu/gnutls28 | <3.8.1-4ubuntu1.1 | 3.8.1-4ubuntu1.1 |
| ubuntu/gnutls28 | <3.8.2 | 3.8.2 |
| debian/gnutls28 | <=3.6.7-4+deb10u8<=3.7.1-5+deb11u3 | 3.6.7-4+deb10u12 3.7.1-5+deb11u4 3.7.9-2+deb12u2 3.8.5-2 |
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Reference Links
- https://gitlab.com/gnutls/gnutls/-/issues/1511
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2251902
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2251904
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2251903
- https://access.redhat.com/errata/RHSA-2024:0155
- https://access.redhat.com/errata/RHSA-2024:0319
- https://access.redhat.com/errata/RHSA-2024:0399
- https://access.redhat.com/errata/RHSA-2024:0451
- https://access.redhat.com/errata/RHSA-2024:0533
- https://bugzilla.redhat.com/show_bug.cgi?id=2248445
- http://www.openwall.com/lists/oss-security/2024/01/19/3
- https://access.redhat.com/security/cve/CVE-2023-5981
- https://gnutls.org/security-new.html#GNUTLS-SA-2023-10-23
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GNXKVR5YNUEBNHAHM5GSYKBZX4W2HMN2/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7ZEIOLORQ7N6WRPFXZSYDL2MC4LP7VFV/
- https://launchpad.net/bugs/cve/CVE-2023-5981
- https://lists.gnupg.org/pipermail/gnutls-help/2023-November/004837.html
- https://gitlab.com/gnutls/gnutls/-/commit/29d6298d0b04cfff970b993915db71ba3f580b6d
- https://security-tracker.debian.org/tracker/CVE-2023-5981
- https://ubuntu.com/security/notices/USN-6499-1
- https://ubuntu.com/security/notices/USN-6499-2
- https://www.cve.org/CVERecord?id=CVE-2023-5981
- https://nvd.nist.gov/vuln/detail/CVE-2023-5981
- https://gitlab.com/gnutls/gnutls/-/merge_requests/1787/diffs?commit_id=29d6298d0b04cfff970b993915db71ba3f580b6d
- https://ubuntu.com/security/CVE-2023-5981
Frequently Asked Questions
What is CVE-2023-5981?
CVE-2023-5981 is a vulnerability found in the RSA-PSK key exchange in GnuTLS, where response times to malformed ciphertexts differ from response times of ciphertexts with correct PKCS#1 v1.5 padding.
What is the severity of CVE-2023-5981?
The severity of CVE-2023-5981 is high with a CVSS severity score of 7.4.
Which software versions are affected by CVE-2023-5981?
GnuTLS versions up to and excluding 3.8.2, Gnu Gnutls version 1.5.0, Redhat Linux versions 8.0 and 9.0, and Fedora versions 37 and 38 are affected by CVE-2023-5981.
How can I fix CVE-2023-5981?
To fix CVE-2023-5981, upgrade GnuTLS to version 3.8.3 or higher.
Where can I find more information about CVE-2023-5981?
More information about CVE-2023-5981 can be found on the Red Hat Security Advisory and Bugzilla pages, as well as the GnuTLS GitLab issue.
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