random: Hash continuous areas in the csprng pool.
authorWerner Koch <wk@gnupg.org>
Mon, 8 Aug 2016 10:54:08 +0000 (12:54 +0200)
committerWerner Koch <wk@gnupg.org>
Wed, 17 Aug 2016 08:51:10 +0000 (10:51 +0200)
* random/random-csprng.c (mix_pool): Store the first hash at the end
of the pool.
--

This fixes a long standing bug (since 1998) in Libgcrypt and GnuPG.
An attacker who obtains 580 bytes of the random number from the
standard RNG can trivially predict the next 20 bytes of output.

For use in GnuPG this bug does not affect the default generation of
keys because running gpg for key creation creates at most 2 keys from
the pool: For a single 4096 bit RSA key 512 byte of random are
required and thus for the second key (encryption subkey), 20 bytes
could be predicted from the the first key.  However, the security of
an OpenPGP key depends on the primary key (which was generated first)
and thus the 20 predictable bytes should not be a problem.  For the
default key length of 2048 bit nothing will be predictable.

For the former default of DSA+Elgamal key it is complicate to give an
answer: For 2048 bit keys a pool of 30 non-secret candidate primes of
about 300 bits each are first created.  This reads at least 1140 bytes
from the pool and thus parts could be predicted.  At some point a 256
bit secret is read from the pool; which in the worst case might be
partly predictable.

The bug was found and reported by Felix Dörre and Vladimir Klebanov,
Karlsruhe Institute of Technology.  A paper describing the problem in
detail will shortly be published.

CVE-id: CVE-2016-6313
Signed-off-by: Werner Koch <wk@gnupg.org>
random/random-csprng.c

index 54ec277..5a771c2 100644 (file)
@@ -553,23 +553,22 @@ _gcry_rngcsprng_randomize (void *buffer, size_t length,
  * bytes.
  *         <................600...............>   <.64.>
  * pool   |------------------------------------| |------|
- *         <..44..>                        <20>
- *            |                             |
- *            |                             +-----+
- *            +-----------------------------------|--+
- *                                                v  v
+ *         <20><.24.>                      <20>
+ *          |     |                         +-----+
+ *          +-----|-------------------------------|-+
+ *                +-------------------------------|-|-+
+ *                                                v v v
  *                                               |------|
  *                                                <hash>
- *                                                  |
  *          +---------------------------------------+
  *          v
  *         <20>
  * pool'  |------------------------------------|
- *         <20><20><..44..>
- *          |         |
- *          |         +------------------------------+
- *          +-------------------------------------+  |
- *                                                v  v
+ *         <20><20><.24.>
+ *          +---|-----|---------------------------+
+ *              +-----|---------------------------|-+
+ *                    +---------------------------|-|-+
+ *                                                v v v
  *                                               |------|
  *                                                <hash>
  *                                                  |
@@ -577,13 +576,11 @@ _gcry_rngcsprng_randomize (void *buffer, size_t length,
  *              v
  *             <20>
  * pool'' |------------------------------------|
- *         <20><20><20><..44..>
- *              |         |
- *              |         +--------------------------+
- *              +---------------------------------+  |
- *                                                v  v
- *                                               |------|
- *                                                <hash>
+ *         <20><20><20><.24.>
+ *              +---|-----|-----------------------+
+ *                  +-----|-----------------------|-+
+ *                        +-----------------------|-|-+
+ *                                                v v v
  *
  * and so on until we did this for all 30 blocks.
  *
@@ -611,9 +608,9 @@ mix_pool(unsigned char *pool)
   gcry_assert (pool_is_locked);
   _gcry_sha1_mixblock_init (&md);
 
-  /* Loop over the pool.  */
+  /* pool_0 -> pool'.  */
   pend = pool + POOLSIZE;
-  memcpy (hashbuf, pend - DIGESTLEN, DIGESTLEN );
+  memcpy (hashbuf, pend - DIGESTLEN, DIGESTLEN);
   memcpy (hashbuf+DIGESTLEN, pool, BLOCKLEN-DIGESTLEN);
   nburn = _gcry_sha1_mixblock (&md, hashbuf);
   memcpy (pool, hashbuf, DIGESTLEN);
@@ -624,19 +621,17 @@ mix_pool(unsigned char *pool)
         pool[i] ^= failsafe_digest[i];
     }
 
+  /* Loop for the remaining iterations.  */
   p = pool;
   for (n=1; n < POOLBLOCKS; n++)
     {
-      memcpy (hashbuf, p, DIGESTLEN);
-
-      p += DIGESTLEN;
-      if (p+DIGESTLEN+BLOCKLEN < pend)
-        memcpy (hashbuf+DIGESTLEN, p+DIGESTLEN, BLOCKLEN-DIGESTLEN);
+      if (p + BLOCKLEN < pend)
+        memcpy (hashbuf, p, BLOCKLEN);
       else
         {
-          unsigned char *pp = p + DIGESTLEN;
+          unsigned char *pp = p;
 
-          for (i=DIGESTLEN; i < BLOCKLEN; i++ )
+          for (i=0; i < BLOCKLEN; i++ )
             {
               if ( pp >= pend )
                 pp = pool;
@@ -645,7 +640,8 @@ mix_pool(unsigned char *pool)
        }
 
       _gcry_sha1_mixblock (&md, hashbuf);
-      memcpy(p, hashbuf, DIGESTLEN);
+      p += DIGESTLEN;
+      memcpy (p, hashbuf, DIGESTLEN);
     }
 
   /* Our hash implementation does only leave small parts (64 bytes)