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netfilter: xt_sctp: validate the flag_info count

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sctp_mt_check doesn't validate the flag_count field. An attacker can
take advantage of that to trigger a OOB read and leak memory
information.

Add the field validation in the checkentry function.

Fixes: 2e4e6a17af ("[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables")
Cc: stable@vger.kernel.org
Reported-by: Lucas Leong <wmliang@infosec.exchange>
Signed-off-by: Wander Lairson Costa <wander@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Wander Lairson Costa 2023-08-28 19:12:55 -03:00 committed by Pablo Neira Ayuso
parent 28427f368f
commit e994764976
1 changed files with 2 additions and 0 deletions
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2
net/netfilter/xt_sctp.c
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@ -149,6 +149,8 @@ static int sctp_mt_check(const struct xt_mtchk_param *par)
{ {
const struct xt_sctp_info *info = par->matchinfo; const struct xt_sctp_info *info = par->matchinfo;
if (info->flag_count > ARRAY_SIZE(info->flag_info))
return -EINVAL;
if (info->flags & ~XT_SCTP_VALID_FLAGS) if (info->flags & ~XT_SCTP_VALID_FLAGS)
return -EINVAL; return -EINVAL;
if (info->invflags & ~XT_SCTP_VALID_FLAGS) if (info->invflags & ~XT_SCTP_VALID_FLAGS)