gnupg: CVE-2013-4351

GnuPG 1.4.x, 2.0.x, and 2.1.x treats a key flags subpacket with all bits
cleared (no usage permitted) as if it has all bits set (all usage permitted),
which might allow remote attackers to bypass intended cryptographic protection
mechanisms by leveraging the subkey.

(From OE-Core rev: 259aebc9dbcaeb1587aaaab849942f55fa321724)

Signed-off-by: Ming Liu <ming.liu@windriver.com>
Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/meta/recipes-support/gnupg/gnupg-1.4.7/CVE-2013-4351.patch b/meta/recipes-support/gnupg/gnupg-1.4.7/CVE-2013-4351.patch
new file mode 100644
index 0000000000..b29ede4233
--- /dev/null
+++ b/meta/recipes-support/gnupg/gnupg-1.4.7/CVE-2013-4351.patch
@@ -0,0 +1,44 @@
+Upstream-Status: Backport
+
+Index: gnupg-1.4.7/g10/getkey.c
+===================================================================
+--- gnupg-1.4.7.orig/g10/getkey.c       2007-03-05 16:54:41.000000000 +0800
++++ gnupg-1.4.7/g10/getkey.c    2013-11-28 14:41:59.640212240 +0800
+@@ -1454,7 +1454,11 @@
+ 
+       if(flags)
+        key_usage |= PUBKEY_USAGE_UNKNOWN;
++      if (!key_usage)
++       key_usage |= PUBKEY_USAGE_NONE;
+     }
++  else if (p)
++    key_usage |= PUBKEY_USAGE_NONE;
+ 
+   /* We set PUBKEY_USAGE_UNKNOWN to indicate that this key has a
+      capability that we do not handle.  This serves to distinguish
+Index: gnupg-1.4.7/g10/keygen.c
+===================================================================
+--- gnupg-1.4.7.orig/g10/keygen.c       2007-02-05 00:27:40.000000000 +0800
++++ gnupg-1.4.7/g10/keygen.c    2013-11-28 14:43:05.016670092 +0800
+@@ -209,9 +209,6 @@
+     if (use & PUBKEY_USAGE_AUTH)
+         buf[0] |= 0x20;
+ 
+-    if (!buf[0]) 
+-        return;
+-
+     build_sig_subpkt (sig, SIGSUBPKT_KEY_FLAGS, buf, 1);
+ }
+ 
+Index: gnupg-1.4.7/include/cipher.h
+===================================================================
+--- gnupg-1.4.7.orig/include/cipher.h   2006-04-21 20:39:49.000000000 +0800
++++ gnupg-1.4.7/include/cipher.h        2013-11-28 14:49:24.159322744 +0800
+@@ -52,6 +52,7 @@
+ #define PUBKEY_USAGE_CERT    4      /* key is also good to certify other keys*/
+ #define PUBKEY_USAGE_AUTH    8      /* key is good for authentication */
+ #define PUBKEY_USAGE_UNKNOWN 128    /* key has an unknown usage bit */
++#define PUBKEY_USAGE_NONE    256    /* No usage given. */
+ 
+ #define DIGEST_ALGO_MD5       1
+ #define DIGEST_ALGO_SHA1      2