On 6/24/20 3:12 PM, Pablo Neira Ayuso wrote:
CC'ing stable@vger.kernel.org
On Tue, Jun 09, 2020 at 10:53:22AM +0300, Vasily Averin wrote:
Could you please push this patch into stable@? it fixes memory corruption in kernels v3.5 .. v4.10
Lost .data_len definition leads to write beyond end of struct nf_ct_h323_master. Usually it corrupts following struct nf_conn_nat, however if nat is not loaded it corrupts following slab object.
In mainline this problem went away in v4.11, after commit 9f0f3ebeda47 ("netfilter: helpers: remove data_len usage for inkernel helpers") however many stable kernels are still affected.
-stable maintainers of: 3.16, 4.4 and 4.9.
Please apply this patch, thanks.
It fixes CVE-2020-14305 https://access.redhat.com/security/cve/CVE-2020-14305
cc: stable@vger.kernel.org Fixes: 1afc56794e03 ("netfilter: nf_ct_helper: implement variable length helper private data") # v3.5 Signed-off-by: Vasily Averin vvs@virtuozzo.com
net/netfilter/nf_conntrack_h323_main.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/net/netfilter/nf_conntrack_h323_main.c b/net/netfilter/nf_conntrack_h323_main.c index f65d93639d12..29fe1e7eac88 100644 --- a/net/netfilter/nf_conntrack_h323_main.c +++ b/net/netfilter/nf_conntrack_h323_main.c @@ -1225,6 +1225,7 @@ static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = { { .name = "Q.931", .me = THIS_MODULE,
.data_len = sizeof(struct nf_ct_h323_master),-- 2.17.1