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CVE-2013-3223 ax25: information leak via msg_name in ax25_recvmsg (rhbz 955662 955666)

This commit is contained in:
Josh Boyer 2013-04-23 09:44:42 -04:00
parent 2d3286ee13
commit 4a7e4a4d41
2 changed files with 45 additions and 0 deletions
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38
ax25-fix-info-leak-via-msg_name-in-ax25_recvmsg.patch Normal file
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@ -0,0 +1,38 @@
From ef3313e84acbf349caecae942ab3ab731471f1a1 Mon Sep 17 00:00:00 2001
From: Mathias Krause <minipli@googlemail.com>
Date: Sun, 7 Apr 2013 01:51:48 +0000
Subject: [PATCH] ax25: fix info leak via msg_name in ax25_recvmsg()
When msg_namelen is non-zero the sockaddr info gets filled out, as
requested, but the code fails to initialize the padding bytes of struct
sockaddr_ax25 inserted by the compiler for alignment. Additionally the
msg_namelen value is updated to sizeof(struct full_sockaddr_ax25) but is
not always filled up to this size.
Both issues lead to the fact that the code will leak uninitialized
kernel stack bytes in net/socket.c.
Fix both issues by initializing the memory with memset(0).
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/ax25/af_ax25.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index 7b11f8b..e277e38 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -1642,6 +1642,7 @@ static int ax25_recvmsg(struct kiocb *iocb, struct socket *sock,
ax25_address src;
const unsigned char *mac = skb_mac_header(skb);
+ memset(sax, 0, sizeof(struct full_sockaddr_ax25));
ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL,
&digi, NULL, NULL);
sax->sax25_family = AF_AX25;
--
1.8.1.4

7
kernel.spec
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@ -795,6 +795,9 @@ Patch25016: net-fix-incorrect-credentials-passing.patch
#CVE-2013-3225 rhbz 955649 955658
Patch25017: Bluetooth-RFCOMM-Fix-missing-msg_namelen-update-in-r.patch
#CVE-2013-3223 rhbz 955662 955666
Patch25018: ax25-fix-info-leak-via-msg_name-in-ax25_recvmsg.patch
# END OF PATCH DEFINITIONS
%endif
@ -1548,6 +1551,9 @@ ApplyPatch net-fix-incorrect-credentials-passing.patch
#CVE-2013-3225 rhbz 955649 955658
ApplyPatch Bluetooth-RFCOMM-Fix-missing-msg_namelen-update-in-r.patch
#CVE-2013-3223 rhbz 955662 955666
ApplyPatch ax25-fix-info-leak-via-msg_name-in-ax25_recvmsg.patch
# END OF PATCH APPLICATIONS
%endif
@ -2405,6 +2411,7 @@ fi
# '-'
%changelog
* Tue Apr 23 2013 Josh Boyer <jwboyer@redhat.com>
- CVE-2013-3223 ax25: information leak via msg_name in ax25_recvmsg (rhbz 955662 955666)
- CVE-2013-3225 Bluetooth: RFCOMM missing msg_namelen update in rfcomm_sock_recvmsg (rhbz 955649 955658)
- CVE-2013-1979 net: incorrect SCM_CREDENTIALS passing (rhbz 955629 955647)
- CVE-2013-3224 Bluetooth: possible info leak in bt_sock_recvmsg (rhbz 955599 955607)