medium
5.9
CWE
203
EPSS
0.060%
Advisory Published
CVE Published
CVE Published
Advisory Published
Updated

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

Affected SoftwareAffected VersionHow to fix
redhat/GnuTLS<3.8.2
3.8.2
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
IBM Security Verify Governance, Identity Manager software component<=ISVG 10.0.2
IBM Security Verify Governance, Identity Manager virtual appliance component<=ISVG 10.0.2
F5 BIG-IP Next (LTM)>=20.0.1<=20.0.2
20.1.0
F5 BIG-IP Next Central Manager>=20.0.1<=20.0.2
20.1.0
F5 BIG-IP Next>=1.5.0<=1.9.1
F5 BIG-IP Next>=1.1.0<=1.3.0
F5 BIG-IP and BIG-IQ Centralized Management>=17.1.0<=17.1.2
F5 BIG-IP and BIG-IQ Centralized Management>=16.1.0<=16.1.5
F5 BIG-IP and BIG-IQ Centralized Management>=15.1.0<=15.1.10
F5 BIG-IP and BIG-IQ Centralized Management>=8.0.0<=8.3.0
F5 F5OS-A=1.7.0>=1.5.0<=1.5.2=1.4.0>=1.3.0<=1.3.2
F5 F5OS-C>=1.6.0<=1.6.2>=1.5.0<=1.5.1
F5 Traffix Systems Signaling Delivery Controller>=5.1.0<=5.2.0
Debian GnuTLS=1.5.0
Red Hat Linux=8.0
Red Hat Linux=9.0
Fedora=37
Fedora=38

Remedy

https://gitlab.com/gnutls/gnutls/-/merge_requests/1787/diffs?commit_id=29d6298d0b04cfff970b993915db71ba3f580b6d

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

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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