A NULL pointer dereference flaw was found in GnuTLS. As Nettles 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.
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Gnutls | Gnu | * | 3.7.3 (excluding) |
| Gnutls26 | Ubuntu | precise/esm | * |
| Gnutls26 | Ubuntu | trusty | * |
| Gnutls26 | Ubuntu | trusty/esm | * |
| Gnutls28 | Ubuntu | bionic | * |
| Gnutls28 | Ubuntu | esm-infra/xenial | * |
| Gnutls28 | Ubuntu | focal | * |
| Gnutls28 | Ubuntu | impish | * |
| Gnutls28 | Ubuntu | trusty | * |
| Gnutls28 | Ubuntu | upstream | * |
| Gnutls28 | Ubuntu | xenial | * |