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Merge pull request #8845 from rycee/fix/dtach-CVE-2012-3368

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dtach: fix CVE-2012-3368
This commit is contained in:
William A. Kennington III 2015-07-15 17:41:45 -07:00
commit 0861cb2c7d
2 changed files with 51 additions and 0 deletions
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2
pkgs/tools/misc/dtach/default.nix
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@ -8,6 +8,8 @@ stdenv.mkDerivation rec {
sha256 = "16614ebddf8ab2811d3dc0e7f329c7de88929ac6a9632d4cb4aef7fe11b8f2a9";
};
patches = [ ./fix-CVE-2012-3368.patch ];
installPhase = ''
mkdir -p $out/bin
cp dtach $out/bin/dtach

49
pkgs/tools/misc/dtach/fix-CVE-2012-3368.patch Normal file
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@ -0,0 +1,49 @@
Fix error handling for read from stdin in attach.c
attach.c did not correctly handle a read from stdin when read returned
an error. The code assigned the return value of read to pkt.len (an
unsigned char) before checking the value. This prevented the error check
from working correctly, since an unsigned integer can never be < 0.
A packet with an invalid length was then sent to the master, which then
sent 255 bytes of garbage to the program.
Fix the bug in attach.c and the unchecked packet length bug in master.c.
Report and initial patch by Enrico Scholz.
--- a/master.c 2012/07/01 21:26:10 1.14
+++ b/master.c 2012/07/01 21:44:34 1.15
@@ -351,7 +351,10 @@
/* Push out data to the program. */
if (pkt.type == MSG_PUSH)
- write(the_pty.fd, pkt.u.buf, pkt.len);
+ {
+ if (pkt.len <= sizeof(pkt.u.buf))
+ write(the_pty.fd, pkt.u.buf, pkt.len);
+ }
/* Attach or detach from the program. */
else if (pkt.type == MSG_ATTACH)
--- a/attach.c 2012/07/01 21:26:10 1.12
+++ b/attach.c 2012/07/01 21:44:34 1.13
@@ -237,12 +237,16 @@
/* stdin activity */
if (n > 0 && FD_ISSET(0, &readfds))
{
+ ssize_t len;
+
pkt.type = MSG_PUSH;
memset(pkt.u.buf, 0, sizeof(pkt.u.buf));
- pkt.len = read(0, pkt.u.buf, sizeof(pkt.u.buf));
+ len = read(0, pkt.u.buf, sizeof(pkt.u.buf));
- if (pkt.len <= 0)
+ if (len <= 0)
exit(1);
+
+ pkt.len = len;
process_kbd(s, &pkt);
n--;
}