[Bug 1812451] Re: In windows host, tftp arbitrary file read vulnerability

[Thomas Huth]

** Changed in: qemu
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1812451

Title:
  In windows host, tftp arbitrary file read vulnerability

Status in QEMU:
  Fix Released

Bug description:
  https://github.com/qemu/qemu/blob/master/slirp/tftp.c#L343

    if (!strncmp(req_fname, "../", 3) ||
        req_fname[strlen(req_fname) - 1] == '/' ||
        strstr(req_fname, "/../")) {
        tftp_send_error(spt, 2, "Access violation", tp);
        return;
    }

  There is file path check for not allowing escape tftp directory.
  But, in windows, file path is separated by "\" backslash.
  So, guest can read arbitrary file in Windows host.

  This bug is variant of CVE-2019-2553 - Directory traversal
  vulnerability.

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