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Fix CVE-2016-6318.
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6318
Patch copied from Red Hat:
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-6318
https://bugzilla.redhat.com/attachment.cgi?id=1188599&action=diff
It is not safe to pass words longer than STRINGSIZE further to cracklib
so the longbuffer cannot be longer than STRINGSIZE.
diff -up cracklib-2.9.0/lib/fascist.c.longgecos cracklib-2.9.0/lib/fascist.c
--- cracklib-2.9.0/lib/fascist.c.longgecos 2014-02-06 16:03:59.000000000 +0100
+++ cracklib-2.9.0/lib/fascist.c 2016-08-08 12:05:40.279235815 +0200
@@ -515,7 +515,7 @@ FascistGecosUser(char *password, const c
char gbuffer[STRINGSIZE];
char tbuffer[STRINGSIZE];
char *uwords[STRINGSIZE];
- char longbuffer[STRINGSIZE * 2];
+ char longbuffer[STRINGSIZE];
if (gecos == NULL)
gecos = "";
@@ -596,38 +596,47 @@ FascistGecosUser(char *password, const c
{
for (i = 0; i < j; i++)
{
- strcpy(longbuffer, uwords[i]);
- strcat(longbuffer, uwords[j]);
-
- if (GTry(longbuffer, password))
+ if (strlen(uwords[i]) + strlen(uwords[j]) < STRINGSIZE)
{
- return _("it is derived from your password entry");
- }
-
- strcpy(longbuffer, uwords[j]);
- strcat(longbuffer, uwords[i]);
+ strcpy(longbuffer, uwords[i]);
+ strcat(longbuffer, uwords[j]);
- if (GTry(longbuffer, password))
- {
- return _("it's derived from your password entry");
+ if (GTry(longbuffer, password))
+ {
+ return _("it is derived from your password entry");
+ }
+
+ strcpy(longbuffer, uwords[j]);
+ strcat(longbuffer, uwords[i]);
+
+ if (GTry(longbuffer, password))
+ {
+ return _("it's derived from your password entry");
+ }
}
- longbuffer[0] = uwords[i][0];
- longbuffer[1] = '\0';
- strcat(longbuffer, uwords[j]);
-
- if (GTry(longbuffer, password))
+ if (strlen(uwords[j]) < STRINGSIZE - 1)
{
- return _("it is derivable from your password entry");
+ longbuffer[0] = uwords[i][0];
+ longbuffer[1] = '\0';
+ strcat(longbuffer, uwords[j]);
+
+ if (GTry(longbuffer, password))
+ {
+ return _("it is derivable from your password entry");
+ }
}
- longbuffer[0] = uwords[j][0];
- longbuffer[1] = '\0';
- strcat(longbuffer, uwords[i]);
-
- if (GTry(longbuffer, password))
+ if (strlen(uwords[i]) < STRINGSIZE - 1)
{
- return _("it's derivable from your password entry");
+ longbuffer[0] = uwords[j][0];
+ longbuffer[1] = '\0';
+ strcat(longbuffer, uwords[i]);
+
+ if (GTry(longbuffer, password))
+ {
+ return _("it's derivable from your password entry");
+ }
}
}
}
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