linux kernel 2.6.38.8 econet infoleak to the network

2011.06.24
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-200


CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: None
Availability impact: None

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:

http://www.openwall.com/lists/oss-security/2011/03/21/4
http://www.openwall.com/lists/oss-security/2011/03/21/1
http://www.openwall.com/lists/oss-security/2011/03/18/15
http://marc.info/?l=linux-netdev&m=130036203528021&w=2
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=67c5c6cb8129c595f21e88254a3fc6b3b841ae8e
https://bugzilla.redhat.com/show_bug.cgi?id=591815#c14
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39


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