tcpdump: add security fix patch

Fixes CVE-2014-9140, PPP dissector vulnerability.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

diff --git a/package/tcpdump/0005-fix-CVE-2014-9140.patch b/package/tcpdump/0005-fix-CVE-2014-9140.patch
new file mode 100644 (file)
index 0000000..86365d0
--- /dev/null
+++ b/package/tcpdump/0005-fix-CVE-2014-9140.patch
@@ -0,0 +1,59 @@
+From 0f95d441e4b5d7512cc5c326c8668a120e048eda Mon Sep 17 00:00:00 2001
+From: Guy Harris <guy@alum.mit.edu>
+Date: Wed, 22 Oct 2014 12:31:21 -0700
+Subject: [PATCH] Do bounds checking when unescaping PPP.
+
+Clean up a const issue while we're at it.
+
+Upstream commit 0f95d441e4b5d.
+
+Signed-off-by: Baruch Siach <baruch@tkos.co.il>
+---
+ print-ppp.c | 16 ++++++++--------
+ 1 file changed, 8 insertions(+), 8 deletions(-)
+
+diff --git a/print-ppp.c b/print-ppp.c
+index 8e098f05a953..9a983e6179cd 100644
+--- a/print-ppp.c
++++ b/print-ppp.c
+@@ -1351,14 +1351,15 @@ static void
+ ppp_hdlc(netdissect_options *ndo,
+          const u_char *p, int length)
+ {
+-      u_char *b, *s, *t, c;
++      u_char *b, *t, c;
++      const u_char *s;
+       int i, proto;
+       const void *se;
+ 
+         if (length <= 0)
+                 return;
+ 
+-      b = (uint8_t *)malloc(length);
++      b = (u_char *)malloc(length);
+       if (b == NULL)
+               return;
+ 
+@@ -1367,14 +1368,13 @@ ppp_hdlc(netdissect_options *ndo,
+        * Do this so that we dont overwrite the original packet
+        * contents.
+        */
+-      for (s = (u_char *)p, t = b, i = length; i > 0; i--) {
++      for (s = p, t = b, i = length; i > 0 && ND_TTEST(*s); i--) {
+               c = *s++;
+               if (c == 0x7d) {
+-                      if (i > 1) {
+-                              i--;
+-                              c = *s++ ^ 0x20;
+-                      } else
+-                              continue;
++                      if (i <= 1 || !ND_TTEST(*s))
++                              break;
++                      i--;
++                      c = *s++ ^ 0x20;
+               }
+               *t++ = c;
+       }
+-- 
+2.1.3
+