From f24e6cf6a39300ad0c3726a41a4aab51ad54c109 Mon Sep 17 00:00:00 2001
From: Michael R Sweet <michael.r.sweet@gmail.com>
Date: Thu, 15 Aug 2019 14:08:31 -0400
Subject: [PATCH] Fix multiple security/disclosure issues:

- CVE-2019-8696 and CVE-2019-8675: Fixed SNMP buffer overflows (rdar://51685251)
- Fixed IPP buffer overflow (rdar://50035411)
- Fixed memory disclosure issue in the scheduler (rdar://51373853)
- Fixed DoS issues in the scheduler (rdar://51373929)
---
 CHANGES.md         |  6 +++++-
 cups/http.c        |  9 +++++++--
 cups/ipp.c         |  9 ++-------
 cups/snmp.c        | 20 +++++++++++++++++++-
 scheduler/client.c | 23 ++++++++++++-----------
 5 files changed, 45 insertions(+), 22 deletions(-)

diff --git a/cups/http.c b/cups/http.c
index 5c14ef68e..3fadb5acb 100644
--- a/cups/http.c
+++ b/cups/http.c
@@ -1905,7 +1905,7 @@ httpPrintf(http_t     *http,		/* I - HTTP connection */
 	   ...)				/* I - Additional args as needed */
 {
   ssize_t	bytes;			/* Number of bytes to write */
-  char		buf[16384];		/* Buffer for formatted string */
+  char		buf[65536];		/* Buffer for formatted string */
   va_list	ap;			/* Variable argument pointer */
 
 
@@ -1917,7 +1917,12 @@ httpPrintf(http_t     *http,		/* I - HTTP connection */
 
   DEBUG_printf(("3httpPrintf: (" CUPS_LLFMT " bytes) %s", CUPS_LLCAST bytes, buf));
 
-  if (http->data_encoding == HTTP_ENCODING_FIELDS)
+  if (bytes > (ssize_t)(sizeof(buf) - 1))
+  {
+    http->error = ENOMEM;
+    return (-1);
+  }
+  else if (http->data_encoding == HTTP_ENCODING_FIELDS)
     return ((int)httpWrite2(http, buf, (size_t)bytes));
   else
   {
diff --git a/cups/ipp.c b/cups/ipp.c
index eaa8c78ca..b0762fdcb 100644
--- a/cups/ipp.c
+++ b/cups/ipp.c
@@ -4553,9 +4553,7 @@ ippSetValueTag(
         break;
 
     case IPP_TAG_NAME :
-        if (temp_tag != IPP_TAG_KEYWORD && temp_tag != IPP_TAG_URI &&
-            temp_tag != IPP_TAG_URISCHEME && temp_tag != IPP_TAG_LANGUAGE &&
-            temp_tag != IPP_TAG_MIMETYPE)
+        if (temp_tag != IPP_TAG_KEYWORD)
           return (0);
 
         (*attr)->value_tag = (ipp_tag_t)(IPP_TAG_NAME | ((*attr)->value_tag & IPP_TAG_CUPS_CONST));
@@ -4563,10 +4561,7 @@ ippSetValueTag(
 
     case IPP_TAG_NAMELANG :
     case IPP_TAG_TEXTLANG :
-        if (value_tag == IPP_TAG_NAMELANG &&
-            (temp_tag != IPP_TAG_NAME && temp_tag != IPP_TAG_KEYWORD &&
-             temp_tag != IPP_TAG_URI && temp_tag != IPP_TAG_URISCHEME &&
-             temp_tag != IPP_TAG_LANGUAGE && temp_tag != IPP_TAG_MIMETYPE))
+        if (value_tag == IPP_TAG_NAMELANG && (temp_tag != IPP_TAG_NAME && temp_tag != IPP_TAG_KEYWORD))
           return (0);
 
         if (value_tag == IPP_TAG_TEXTLANG && temp_tag != IPP_TAG_TEXT)
diff --git a/cups/snmp.c b/cups/snmp.c
index 8437528dd..fc9396177 100644
--- a/cups/snmp.c
+++ b/cups/snmp.c
@@ -1233,6 +1233,9 @@ asn1_get_integer(
   int	value;				/* Integer value */
 
 
+  if (*buffer >= bufend)
+    return (0);
+
   if (length > sizeof(int))
   {
     (*buffer) += length;
@@ -1259,6 +1262,9 @@ asn1_get_length(unsigned char **buffer,	/* IO - Pointer in buffer */
   unsigned	length;			/* Length */
 
 
+  if (*buffer >= bufend)
+    return (0);
+
   length = **buffer;
   (*buffer) ++;
 
@@ -1301,6 +1307,9 @@ asn1_get_oid(
   int		number;			/* OID number */
 
 
+  if (*buffer >= bufend)
+    return (0);
+
   valend = *buffer + length;
   oidptr = oid;
   oidend = oid + oidsize - 1;
@@ -1349,9 +1358,12 @@ asn1_get_packed(
   int	value;				/* Value */
 
 
+  if (*buffer >= bufend)
+    return (0);
+
   value = 0;
 
-  while ((**buffer & 128) && *buffer < bufend)
+  while (*buffer < bufend && (**buffer & 128))
   {
     value = (value << 7) | (**buffer & 127);
     (*buffer) ++;
@@ -1379,6 +1391,9 @@ asn1_get_string(
     char          *string,		/* I  - String buffer */
     size_t        strsize)		/* I  - String buffer size */
 {
+  if (*buffer >= bufend)
+    return (NULL);
+
   if (length > (unsigned)(bufend - *buffer))
     length = (unsigned)(bufend - *buffer);
 
@@ -1421,6 +1436,9 @@ asn1_get_type(unsigned char **buffer,	/* IO - Pointer in buffer */
   int	type;				/* Type */
 
 
+  if (*buffer >= bufend)
+    return (0);
+
   type = **buffer;
   (*buffer) ++;
 
diff --git a/scheduler/client.c b/scheduler/client.c
index a21b909a8..680508047 100644
--- a/scheduler/client.c
+++ b/scheduler/client.c
@@ -568,6 +568,17 @@ cupsdReadClient(cupsd_client_t *con)	/* I - Client to read from */
 
   cupsdLogClient(con, CUPSD_LOG_DEBUG2, "cupsdReadClient: error=%d, used=%d, state=%s, data_encoding=HTTP_ENCODING_%s, data_remaining=" CUPS_LLFMT ", request=%p(%s), file=%d", httpError(con->http), (int)httpGetReady(con->http), httpStateString(httpGetState(con->http)), httpIsChunked(con->http) ? "CHUNKED" : "LENGTH", CUPS_LLCAST httpGetRemaining(con->http), con->request, con->request ? ippStateString(ippGetState(con->request)) : "", con->file);
 
+  if (httpError(con->http) == EPIPE && !httpGetReady(con->http) && recv(httpGetFd(con->http), buf, 1, MSG_PEEK) < 1)
+  {
+   /*
+    * Connection closed...
+    */
+
+    cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing on EOF.");
+    cupsdCloseClient(con);
+    return;
+  }
+
   if (httpGetState(con->http) == HTTP_STATE_GET_SEND ||
       httpGetState(con->http) == HTTP_STATE_POST_SEND ||
       httpGetState(con->http) == HTTP_STATE_STATUS)
@@ -577,17 +588,6 @@ cupsdReadClient(cupsd_client_t *con)	/* I - Client to read from */
     * connection and we need to shut it down...
     */
 
-    if (!httpGetReady(con->http) && recv(httpGetFd(con->http), buf, 1, MSG_PEEK) < 1)
-    {
-     /*
-      * Connection closed...
-      */
-
-      cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing on EOF.");
-      cupsdCloseClient(con);
-      return;
-    }
-
     cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing on unexpected HTTP read state %s.", httpStateString(httpGetState(con->http)));
     cupsdCloseClient(con);
     return;
@@ -2209,6 +2209,7 @@ cupsdSendError(cupsd_client_t *con,	/* I - Connection */
   strlcpy(location, httpGetField(con->http, HTTP_FIELD_LOCATION), sizeof(location));
 
   httpClearFields(con->http);
+  httpClearCookie(con->http);
 
   httpSetField(con->http, HTTP_FIELD_LOCATION, location);
 
