[Midnightbsd-cvs] [MidnightBSD/src] eb07f2: wg: check for crypto operation errors (CVE-2026-58...

[Lucas Holt]

  Branch: refs/heads/master
  Home:   https://github.com/MidnightBSD/src
  Commit: eb07f298f03498b2e6e48c3b266b1338cd56c1a1
      https://github.com/MidnightBSD/src/commit/eb07f298f03498b2e6e48c3b266b1338cd56c1a1
  Author: Lucas Holt <luke at foolishgames.com>
  Date:   2026-07-30 (Thu, 30 Jul 2026)

  Changed paths:
    M UPDATING
    M etc/mtree/BSD.tests.dist
    M sys/dev/wg/wg_crypto.c
    M sys/opencrypto/crypto.c
    M sys/opencrypto/cryptodev.h
    M tests/sys/net/Makefile
    A tests/sys/net/wg/Makefile
    A tests/sys/net/wg/if_wg_nojail.sh

  Log Message:
  -----------
  wg: check for crypto operation errors (CVE-2026-58085)

After dispatching a decrypt operation to OCF, wg(4) only checked the
return value of crypto_dispatch(), not the result of the operation
itself, so packets with an invalid Poly1305 authentication tag were
silently accepted.  A remote attacker able to send UDP packets to a
WireGuard endpoint, and able to guess the bounds of the receiver's
replay window, could inject forged or modified transport data packets
into the tunnel; an attacker able to intercept traffic could modify
the ciphertext and authenticated data undetected.

Propagate crp_etype from both the encrypt and decrypt paths.  Since
the dispatch code assumes synchronous OCF sessions by design, also
reject a created session that is not synchronous; software sessions
are always synchronous in practice, so this should be a nop.

Add CRYPTO_SESS_SYNC() to <opencrypto/cryptodev.h>, an OCF fail point
to inject decryption failures, and a regression test exercising a bad
decrypt over a wg(4) tunnel.

Obtained from:	FreeBSD (4cb888c9ec4b, 825c6f45b147)
Security:	FreeBSD-SA-26:52.if_wg
Security:	CVE-2026-58085

AI-Assisted-by: Claude Opus 5 (1M context) <noreply at anthropic.com>
Signed-off-by: Lucas Holt <luke at foolishgames.com>



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