gnutls28: A NULL pointer dereference flaw was found in GnuTLS
CVE-2021-4209 is fixed in 7 products on 1 platform, first by gnutls-bin 3.5.18-1ubuntu1.6, released August 1, 2022. It is not reported as exploited. Patch Radar priority: Routine.
A NULL pointer dereference flaw was found in GnuTLS. As Nettle's hash update functions internally call memcpy, providing zero-length input may cause undefined behavior. This flaw leads to a denial of service after authentication in rare circumstances.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| gnutls-bin · Ubuntu 18.04.6 LTS (bionic) | 3.5.18-1ubuntu1.6 | gnutls-bin 3.5.18-1ubuntu1.6 | Aug 1, 2022 |
| gnutls-bin · Ubuntu 20.04 LTS (focal) | 3.6.13-2ubuntu1.7 | gnutls-bin 3.6.13-2ubuntu1.7 | Aug 1, 2022 |
| gnutls28 · Debian 12.15 (bookworm) | 3.7.3-2 | DEBIAN-CVE-2021-4209 | Aug 24, 2022 |
| gnutls28 · Debian 13.5 (trixie) | 3.7.3-2 | DEBIAN-CVE-2021-4209 | Aug 24, 2022 |
| gnutls28 · Debian 14 | 3.7.3-2 | DEBIAN-CVE-2021-4209 | Aug 24, 2022 |
| guile-gnutls · Ubuntu 20.04 LTS (focal) | 3.6.13-2ubuntu1.7 | guile-gnutls 3.6.13-2ubuntu1.7 | Aug 1, 2022 |
| libgnutls-dane0 · Ubuntu 18.04.6 LTS (bionic) | 3.5.18-1ubuntu1.6 | libgnutls-dane0 3.5.18-1ubuntu1.6 | Aug 1, 2022 |
| libgnutls-dane0 · Ubuntu 20.04 LTS (focal) | 3.6.13-2ubuntu1.7 | libgnutls-dane0 3.6.13-2ubuntu1.7 | Aug 1, 2022 |
| libgnutls-openssl27 · Ubuntu 18.04.6 LTS (bionic) | 3.5.18-1ubuntu1.6 | libgnutls-openssl27 3.5.18-1ubuntu1.6 | Aug 1, 2022 |
| libgnutls-openssl27 · Ubuntu 20.04 LTS (focal) | 3.6.13-2ubuntu1.7 | libgnutls-openssl27 3.6.13-2ubuntu1.7 | Aug 1, 2022 |
| libgnutls30 · Ubuntu 18.04.6 LTS (bionic) | 3.5.18-1ubuntu1.6 | libgnutls30 3.5.18-1ubuntu1.6 | Aug 1, 2022 |
| libgnutls30 · Ubuntu 20.04 LTS (focal) | 3.6.13-2ubuntu1.7 | libgnutls30 3.6.13-2ubuntu1.7 | Aug 1, 2022 |
| libgnutlsxx28 · Ubuntu 18.04.6 LTS (bionic) | 3.5.18-1ubuntu1.6 | libgnutlsxx28 3.5.18-1ubuntu1.6 | Aug 1, 2022 |
| libgnutlsxx28 · Ubuntu 20.04 LTS (focal) | 3.6.13-2ubuntu1.7 | libgnutlsxx28 3.6.13-2ubuntu1.7 | Aug 1, 2022 |
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