Bug: linux kernel 2.6.38.8 econet infoleak to the network ( Ascii Version )

linux kernel 2.6.38.8 econet infoleak to the network

Published	Credit	Risk
2011.06.24	Vasiliy KulikoV	Medium

CWE	CVE	Local	Remote
CWE-200	CVE-2011-1173	No	Yes

struct aunhdr has 4 padding bytes between 'pad' and 'handle' fields on
x86_64. These bytes are not initialized in the variable 'ah' before
sending 'ah' to the network. This leads to 4 bytes kernel stack
infoleak.

This bug was introduced before the git epoch.

Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
---
net/econet/af_econet.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/econet/af_econet.c b/net/econet/af_econet.c
index 0c28263..116d3fd 100644
--- a/net/econet/af_econet.c
+++ b/net/econet/af_econet.c
@@ -435,10 +435,10 @@ static int econet_sendmsg(struct kiocb *iocb, struct socket *sock,
udpdest.sin_addr.s_addr = htonl(network | addr.station);
}

+ memset(&ah, 0, sizeof(ah));
ah.port = port;
ah.cb = cb & 0x7f;
ah.code = 2; /* magic */
- ah.pad = 0;

/* tack our header on the front of the iovec */
size = sizeof(struct aunhdr);
--
1.7.0.4

References: