Friday, November 06

Geek

Daily News Stuff 6 November 2026

Garden Party Edition

Top Story

  • Well, that's dumb: A configuration flaw in certainly flavours of Linux - most of them uncommon but the list includes OpenWRT and Alpine - allows anyone to log in using SSH to account that explicitly forbid logins.  (Bleeping Computer)

    You can disable logins in several ways, one of which is to replace the password hash on the account with * - an invalid hash that can never match any password.

    A patch to OpenSSH in 2016 made it always try to hash the password even though it knew there was no way it could match, to prevent sidechain attacks.

    And then it all went wrong:
    The problem is that the musl C library's crypt() function also returns * when password hashing fails, including when a submitted password exceeds its 256-byte limit.
    Because null is too hard.
    This means an attacker can submit an oversized password and cause OpenSSH to compare the returned * against the account's stored *, resulting in a successful login.
    Ouch.

    It isn't open season; the bug is more specific than that.  But the default AWS template for Alpine Linux is affected.

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