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トップ  >  Linux17歩  >  2017-05-20 dropbear-2017.75にupdate
20170520 dropbear-2017.75にupdateしました


Changelog (2016.74 ~ 2017.75)

2017.75 - 18 May 2017

- Security: Fix double-free in server TCP listener cleanup
  A double-free in the server could be triggered by an authenticated 
  user if dropbear is running with -a (Allow connections to forwarded 
  ports from any host)
  This could potentially allow arbitrary code execution as root by 
  an authenticated user.
  Affects versions 2013.56 to 2016.74. 
  Thanks to Mark Shepard for reporting the crash.

- Security: Fix information disclosure with ~/.ssh/authorized_keys 
  symlink.
  Dropbear parsed authorized_keys as root, even if it were a symlink. 
  The fix is to switch to user permissions when opening authorized_keys

  A user could symlink their ~/.ssh/authorized_keys to a root-owned 
  file they couldn't normally read. If they managed to get that file 
  to contain valid authorized_keys with command= options it might be 
  possible to read other contents of that file.
  This information disclosure is to an already authenticated user.
  Thanks to Jann Horn of Google Project Zero for reporting this.

- Generate hostkeys with dropbearkey atomically and flush to disk 
  with fsync
  Thanks to Andrei Gherzan for a patch

- Fix out of tree builds with bundled libtom
  Thanks to Henrik Nordström and Peter Krefting for patches.
投票数:10 平均点:4.00
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