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| author | Patrick McHardy <kaber@trash.net> | 2006-05-02 23:23:07 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-05-02 14:38:21 -0700 |
| commit | 25b6badde42165b717e3c232e4992b3f6761920a (patch) | |
| tree | 9ab2cf5e5f54d27a1f0cedac4e992ad609dce525 | |
| parent | 42a46c74c4520174b82a60ac44c15b5525cdf238 (diff) | |
| download | kernel-common-25b6badde42165b717e3c232e4992b3f6761920a.tar.gz kernel-common-25b6badde42165b717e3c232e4992b3f6761920a.tar.bz2 kernel-common-25b6badde42165b717e3c232e4992b3f6761920a.zip | |
[PATCH] NETFILTER: SCTP conntrack: fix infinite loop (CVE-2006-1527)
[NETFILTER]: SCTP conntrack: fix infinite loop
fix infinite loop in the SCTP-netfilter code: check SCTP chunk size to
guarantee progress of for_each_sctp_chunk(). (all other uses of
for_each_sctp_chunk() are preceded by do_basic_checks(), so this fix
should be complete.)
Based on patch from Ingo Molnar <mingo@elte.hu>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | net/ipv4/netfilter/ip_conntrack_proto_sctp.c | 11 | ||||
| -rw-r--r-- | net/netfilter/nf_conntrack_proto_sctp.c | 11 |
2 files changed, 14 insertions, 8 deletions
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_sctp.c b/net/ipv4/netfilter/ip_conntrack_proto_sctp.c index be602e8aeab0..df67679a063d 100644 --- a/net/ipv4/netfilter/ip_conntrack_proto_sctp.c +++ b/net/ipv4/netfilter/ip_conntrack_proto_sctp.c @@ -235,12 +235,15 @@ static int do_basic_checks(struct ip_conntrack *conntrack, flag = 1; } - /* Cookie Ack/Echo chunks not the first OR - Init / Init Ack / Shutdown compl chunks not the only chunks */ - if ((sch->type == SCTP_CID_COOKIE_ACK + /* + * Cookie Ack/Echo chunks not the first OR + * Init / Init Ack / Shutdown compl chunks not the only chunks + * OR zero-length. + */ + if (((sch->type == SCTP_CID_COOKIE_ACK || sch->type == SCTP_CID_COOKIE_ECHO || flag) - && count !=0 ) { + && count !=0) || !sch->length) { DEBUGP("Basic checks failed\n"); return 1; } diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c index cf798e61e379..cd2326dde02f 100644 --- a/net/netfilter/nf_conntrack_proto_sctp.c +++ b/net/netfilter/nf_conntrack_proto_sctp.c @@ -240,12 +240,15 @@ static int do_basic_checks(struct nf_conn *conntrack, flag = 1; } - /* Cookie Ack/Echo chunks not the first OR - Init / Init Ack / Shutdown compl chunks not the only chunks */ - if ((sch->type == SCTP_CID_COOKIE_ACK + /* + * Cookie Ack/Echo chunks not the first OR + * Init / Init Ack / Shutdown compl chunks not the only chunks + * OR zero-length. + */ + if (((sch->type == SCTP_CID_COOKIE_ACK || sch->type == SCTP_CID_COOKIE_ECHO || flag) - && count !=0 ) { + && count !=0) || !sch->length) { DEBUGP("Basic checks failed\n"); return 1; } |