Ssh-agent in OpenSSH before 8.5 has a double free that may be relevant in a few less-common scenarios, such as unconstrained agent-socket access on a legacy operating system, or the forwarding of an agent to an attacker-controlled host. This issue was resolved in Akkadian OVA appliance version 3.0 (and later), Akkadian Provisioning Manager 5.0.2 (and later), and Akkadian Appliance Manager 3.3.0.314-4a349e0 (and later). ![]() The restricted shell provided by Akkadian Provisioning Manager Engine (PME) can be bypassed by switching the OpenSSH channel from `shell` to `exec` and providing the ssh client a single execution parameter. NOTE: the vendor's position is "this is not an authentication bypass, since nothing is being bypassed." If a client is using public-key authentication with agent forwarding but without -oLogLevel=verbose, and an attacker has silently modified the server to support the None authentication option, then the user cannot determine whether FIDO authentication is going to confirm that the user wishes to connect to that server, or that the user wishes to allow that server to connect to a different server on the user's behalf. ** DISPUTED ** An issue was discovered in OpenSSH before 8.9. Helper programs for AuthorizedKeysCommand and AuthorizedPrincipalsCommand may run with privileges associated with group memberships of the sshd process, if the configuration specifies running the command as a different user. Sshd in OpenSSH 6.2 through 8.x before 8.8, when certain non-default configurations are used, allows privilege escalation because supplemental groups are not initialized as expected. There are no known workarounds for this issue. Users are advised to upgrade to version 0.0.6, which no longer includes the raw field value in the error message. An attacker able to modify the declared length of a key's sensitive field can thus expose the raw value of that field. ![]() In versions prior to 0.0.6 if a field of a key is shorter than it is declared to be, the parser raises an error with a message containing the raw field value. Openssh_key_parser is an open source Python package providing utilities to parse and pack OpenSSH private and public key files.
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