CVE-2018-4700: Linux session cookies used a predictable random number…

… seed.
apple · Dec 7, 2018 · feb4c62 · feb4c62
1 parent 4fb44b2
commit feb4c62
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Showing 2 changed files with 5 additions and 2 deletions.
diff --git a/CHANGES.md b/CHANGES.md
@@ -1,10 +1,11 @@
-CHANGES - 2.2.10 - 2018-12-06
+CHANGES - 2.2.10 - 2018-12-07
 =============================
 
 
 Changes in CUPS v2.2.10
 -----------------------
 
+- CVE-2018-4700: Linux session cookies used a predictable random number seed.
 - The `lpoptions` command now works with IPP Everywhere printers that have not
   yet been added as local queues (Issue #5045)
 - Added USB quirk rules (Issue #5395, Issue #5443)

diff --git a/cgi-bin/var.c b/cgi-bin/var.c
@@ -1207,6 +1207,7 @@ cgi_set_sid(void)
   const char		*remote_addr,	/* REMOTE_ADDR */
 			*server_name,	/* SERVER_NAME */
 			*server_port;	/* SERVER_PORT */
+  struct timeval	curtime;	/* Current time */
 
 
   if ((remote_addr = getenv("REMOTE_ADDR")) == NULL)
@@ -1216,7 +1217,8 @@ cgi_set_sid(void)
   if ((server_port = getenv("SERVER_PORT")) == NULL)
     server_port = "SERVER_PORT";
 
-  CUPS_SRAND(time(NULL));
+  gettimeofday(&curtime, NULL);
+  CUPS_SRAND(curtime.tv_sec + curtime.tv_usec);
   snprintf(buffer, sizeof(buffer), "%s:%s:%s:%02X%02X%02X%02X%02X%02X%02X%02X",
            remote_addr, server_name, server_port,
 	   (unsigned)CUPS_RAND() & 255, (unsigned)CUPS_RAND() & 255,