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From 2c030c7a06e0c2b8227c7e85f5c58dfb339731d0 Mon Sep 17 00:00:00 2001
From: Michael R Sweet <michael.r.sweet@gmail.com>
Date: Thu, 15 Aug 2019 14:06:47 -0400
Subject: [PATCH] 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)
diff --git a/cups/http.c b/cups/http.c
index 266a15791..fbb1bf13c 100644
--- a/cups/http.c
+++ b/cups/http.c
@@ -1860,7 +1860,7 @@ 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 */
@@ -1872,7 +1872,12 @@ 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 6fae52a00..1bd59cef1 100644
--- a/cups/ipp.c
+++ b/cups/ipp.c
@@ -4550,9 +4550,7 @@ 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));
@@ -4560,10 +4558,7 @@ 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 5cefee454..1d9da01f2 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 923a6e67a..f693e7c49 100644
--- a/scheduler/client.c
+++ b/scheduler/client.c
@@ -564,6 +564,17 @@ 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)
@@ -573,17 +584,6 @@ 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;
@@ -1950,6 +1950,7 @@ 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);
--
2.21.0
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