Reject vulnerable keys to mitigate Debian OpenSSL flaw

In 2008, Debian (and derived distributions such as Ubuntu) shipped an
OpenSSL package with a flawed random number generator, causing OpenSSH to
generate only a very limited set of keys which were subject to private half
precomputation.  To mitigate this, this patch checks key authentications
against a blacklist of known-vulnerable keys, and adds a new ssh-vulnkey
program which can be used to explicitly check keys against that blacklist.
See CVE-2008-0166.

Bug: https://bugzilla.mindrot.org/show_bug.cgi?id=1469
Last-Update: 2013-09-14

Patch-Name: ssh-vulnkey.patch

1 files changed, 1 insertions, 1 deletions

diff --git a/auth-rsa.c b/auth-rsa.c
index 545aa496a..6ed152c5f 100644
--- a/auth-rsa.c
+++ b/auth-rsa.c
@@ -237,7 +237,7 @@ rsa_key_allowed_in_file(struct passwd *pw, char *file,
                 free(fp);
 
                 /* Never accept a revoked key */
-                if (auth_key_is_revoked(key))
+                if (auth_key_is_revoked(key, 0))
                         break;
 
                 /* We have found the desired key. */