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OpenBSD 2.2: Exploitable buffer mismangement exists in a subroutine Print E-mail
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Posted by Team   
OpenBSD An exploitable buffer mismanagement exists in a subroutine used by lprm and lpd. The problem is exploitable by users on a particular machine if there is an entry in /etc/printcap which points at a remote printer.
Apply by doing
	cd /usr/src/usr.sbin/lpr/common_source
	patch -p0 < rmjob.patch

And then to rebuild and install
	cd .. && make && make install

Index: common_source/rmjob.c
RCS file: /cvs/src/usr.sbin/lpr/common_source/rmjob.c,v
retrieving revision 1.8
diff -u -r1.8 rmjob.c
--- rmjob.c	1997/07/23 22:12:12	1.8
+++ rmjob.c	1998/04/22 14:42:23
@@ -333,14 +333,14 @@
-	(void)snprintf(buf, sizeof(buf), "\5%s %s", RP, all ? "-all" : person);
-	cp = buf;
-	for (i = 0; i < users && cp-buf+1+strlen(user[i]) < sizeof buf; i++) {
+	(void)snprintf(buf, sizeof(buf)-2, "\5%s %s", RP, all ? "-all" : 
+	cp = buf + strlen(buf);
+	for (i = 0; i < users && cp-buf+1+strlen(user[i]) < sizeof buf - 2; 
i++) {
 		cp += strlen(cp);
 		*cp++ = ' ';
 		strcpy(cp, user[i]);
-	for (i = 0; i < requests && cp-buf+10 < sizeof(buf) - 1; i++) {
+	for (i = 0; i < requests && cp-buf+10 < sizeof(buf) - 2; i++) {
 		cp += strlen(cp);
 		(void) sprintf(cp, " %d", requ[i]);
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