GNU C Library master sources branch release/2.28/master updated. glibc-2.28-49-gce6ba63

fw@sourceware.org fw@sourceware.org
Tue Nov 27 19:25:00 GMT 2018


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      from  f5cc21eaeea6afbdfd543c63d2a552f141a91781 (commit)

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- Log -----------------------------------------------------------------
http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=ce6ba630dbc96f49eb1f30366aa62261df4792f9

commit ce6ba630dbc96f49eb1f30366aa62261df4792f9
Author: Florian Weimer <fweimer@redhat.com>
Date:   Tue Nov 27 16:12:43 2018 +0100

    CVE-2018-19591: if_nametoindex: Fix descriptor for overlong name [BZ #23927]
    
    (cherry picked from commit d527c860f5a3f0ed687bd03f0cb464612dc23408)

diff --git a/ChangeLog b/ChangeLog
index 8c92ee7..a997003 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2018-11-27  Florian Weimer  <fweimer@redhat.com>
+
+	[BZ #23927]
+	CVE-2018-19591
+	* sysdeps/unix/sysv/linux/if_index.c (__if_nametoindex): Avoid
+	descriptor leak in case of ENODEV error.
+
 2018-11-19  Florian Weimer  <fweimer@redhat.com>
 
 	support: Print timestamps in timeout handler.
diff --git a/NEWS b/NEWS
index e5ca590..5290e21 100644
--- a/NEWS
+++ b/NEWS
@@ -25,7 +25,13 @@ The following bugs are resolved with this release:
   [23717] Fix stack overflow in stdlib/tst-setcontext9
   [23821] si_band in siginfo_t has wrong type long int on sparc64
   [23822] ia64 static libm.a is missing exp2f, log2f and powf symbols
+  [23927] Linux if_nametoindex() does not close descriptor (CVE-2018-19591)
 
+Security related changes:
+
+  CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
+  denial of service due to resource exhaustion when processing getaddrinfo
+  calls with crafted host names.  Reported by Guido Vranken.
 
 Version 2.28
 
diff --git a/sysdeps/unix/sysv/linux/if_index.c b/sysdeps/unix/sysv/linux/if_index.c
index e3d0898..782fc5e 100644
--- a/sysdeps/unix/sysv/linux/if_index.c
+++ b/sysdeps/unix/sysv/linux/if_index.c
@@ -38,11 +38,6 @@ __if_nametoindex (const char *ifname)
   return 0;
 #else
   struct ifreq ifr;
-  int fd = __opensock ();
-
-  if (fd < 0)
-    return 0;
-
   if (strlen (ifname) >= IFNAMSIZ)
     {
       __set_errno (ENODEV);
@@ -50,6 +45,12 @@ __if_nametoindex (const char *ifname)
     }
 
   strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+
+  int fd = __opensock ();
+
+  if (fd < 0)
+    return 0;
+
   if (__ioctl (fd, SIOCGIFINDEX, &ifr) < 0)
     {
       int saved_errno = errno;

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                          |    7 +++++++
 NEWS                               |    6 ++++++
 sysdeps/unix/sysv/linux/if_index.c |   11 ++++++-----
 3 files changed, 19 insertions(+), 5 deletions(-)


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