| Headlines |
| 2024-06-07 |
OpenSSH gains new security feature |
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The OpenSSH suite is getting a new security feature which will assist administrators in blocking connections from pesky client machines. Damien Miller shares the highlights: "When PerSourcePenalties are enabled, sshd(8) will monitor the exit status of its child pre-auth session processes. Through the exit status, it can observe situations where the session did not authenticate as expected. These conditions include when the client repeatedly attempted authentication unsuccessfully (possibly indicating an attack against one or more accounts, e.g. password guessing), or when client behaviour caused sshd to crash (possibly indicating attempts to exploit sshd).
When such a condition is observed, sshd will record a penalty of some duration (e.g. 30 seconds) against the client's address. If this time is above a minimum threshold specified by the PerSourcePenalties, then connections from the client address will be refused (along with any others in the same PerSourceNetBlockSize CIDR range).
Repeated offenses by the same client address will accrue greater penalties, up to a configurable maximum." The new feature is expected to be enabled by default in OpenBSD 7.6, which will likely be publicly available in October 2024. |
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