sshd in OpenSSH before 7.4 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via an out-of-sequence NEWKEYS message, as demonstrated by Honggfuzz, related to kex.c and packet.c.
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 |
|---|---|---|---|
| Openssh | Openbsd | * | 7.4 (excluding) |
| Red Hat Enterprise Linux 7 | RedHat | openssh-0:7.4p1-11.el7 | * |
| Openssh | Ubuntu | precise/esm | * |
| Openssh | Ubuntu | trusty | * |
| Openssh | Ubuntu | upstream | * |
| Openssh | Ubuntu | xenial | * |