Author: emaste
Date: Wed Dec 19 18:16:29 2018
New Revision: 342227
URL: https://svnweb.freebsd.org/changeset/base/342227
Log:
bootpd: validate hardware type
Due to insufficient validation of network-provided data it may have been
possible for a malicious actor to craft a bootp packet which could cause
a stack buffer overflow.
admbugs: 850
Reported by: Reno Robert
Reviewed by: markj
Approved by: so
Security: FreeBSD-SA-18:15.bootpd
Sponsored by: The FreeBSD Foundation
Modified:
head/libexec/bootpd/bootpd.c
Modified: head/libexec/bootpd/bootpd.c
==============================================================================
--- head/libexec/bootpd/bootpd.c Wed Dec 19 18:05:50 2018
(r342226)
+++ head/libexec/bootpd/bootpd.c Wed Dec 19 18:16:29 2018
(r342227)
@@ -636,6 +636,10 @@ handle_request()
char *homedir, *bootfile;
int n;
+ if (bp->bp_htype >= hwinfocnt) {
+ report(LOG_NOTICE, "bad hw addr type %u", bp->bp_htype);
+ return;
+ }
bp->bp_file[sizeof(bp->bp_file)-1] = '\0';
/* XXX - SLIP init: Set bp_ciaddr = recv_addr here? */
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