![]() Published: J2:15:11 PM -0400Īn issue was discovered in OpenSSH 7.9. NOTE: some reports state that 8.5 and 8.6 are also affected. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client). The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. NOTE: the vendor reportedly has stated that they intentionally omit validation of "anomalous argument transfers" because that could "stand a great chance of breaking existing workflows." Published: J10:15:12 AM -0400 ** DISPUTED ** scp in OpenSSH through 8.3p1 allows command injection in the scp.c toremote function, as demonstrated by backtick characters in the destination argument. NOTE: the vendor does not recognize user enumeration as a vulnerability for this product. This occurs because a challenge is sent only when that combination could be valid for a login session. ** DISPUTED ** OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. 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. NOTE: the vendor's position is "this is not an authentication bypass, since nothing is being bypassed." Published: Ma7:15:07 PM -0500 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.
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