In sshd and ssh in OpenSSH before 10.6, an LZ77 dictionary coder can be used even though this is contraindicated by the arXiv 2609.07709 Crossing the Streams findings.
Weakness
A covert channel is a path that can be used to transfer information in a way not intended by the system’s designers.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Openssh-ssh1 | Ubuntu | devel | * |
| Openssh-ssh1 | Ubuntu | esm-apps/bionic | * |
| Openssh-ssh1 | Ubuntu | esm-apps/focal | * |
| Openssh-ssh1 | Ubuntu | esm-apps/jammy | * |
| Openssh-ssh1 | Ubuntu | esm-apps/noble | * |
| Openssh-ssh1 | Ubuntu | esm-apps/resolute | * |
| Openssh-ssh1 | Ubuntu | jammy | * |
| Openssh-ssh1 | Ubuntu | noble | * |
| Openssh-ssh1 | Ubuntu | resolute | * |
| Openssh-ssh1 | Ubuntu | upstream | * |