Author: emaste
Date: Tue Aug 6 16:11:16 2019
New Revision: 350637
URL: https://svnweb.freebsd.org/changeset/base/350637
Log:
MFC r350635: bsnmp: add asn1 message length validation
admbugs: 780
Submitted by: Guido Vranken, bz
Reported by: Guido Vranken
Approved by: so
Security: CVE-2019-5610
Modified:
stable/12/contrib/bsnmp/lib/asn1.c
Directory Properties:
stable/12/ (props changed)
Modified: stable/12/contrib/bsnmp/lib/asn1.c
==============================================================================
--- stable/12/contrib/bsnmp/lib/asn1.c Tue Aug 6 16:11:00 2019
(r350636)
+++ stable/12/contrib/bsnmp/lib/asn1.c Tue Aug 6 16:11:16 2019
(r350637)
@@ -100,6 +100,11 @@ asn_get_header(struct asn_buf *b, u_char *type, asn_le
*len = *b->asn_cptr++;
b->asn_len--;
}
+ if (*len > b->asn_len) {
+ asn_error(b, "len %u exceeding asn_len %u", *len, b->asn_len);
+ return (ASN_ERR_EOBUF);
+ }
+
return (ASN_ERR_OK);
}
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