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GNU C Library master sources branch release/2.26/master updated. glibc-2.26-193-ga0bc5dd
- From: fw at sourceware dot org
- To: glibc-cvs at sourceware dot org
- Date: 27 Nov 2018 20:49:05 -0000
- Subject: GNU C Library master sources branch release/2.26/master updated. glibc-2.26-193-ga0bc5dd
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- Log -----------------------------------------------------------------
http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=a0bc5dd3bed4b04814047265b3bcead7ab973b87
commit a0bc5dd3bed4b04814047265b3bcead7ab973b87
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 23724da..2d3af62 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.
+
2018-11-08 Alexandra Hájková <ahajkova@redhat.com>
[BZ #17630]
diff --git a/NEWS b/NEWS
index 3c708d2..f6d2642 100644
--- a/NEWS
+++ b/NEWS
@@ -82,6 +82,10 @@ Security related changes:
architecture could write beyond the target buffer, resulting in a buffer
overflow. Reported by Andreas Schwab.
+ 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.
+
The following bugs are resolved with this release:
[16750] ldd: Never run file directly.
@@ -158,6 +162,7 @@ The following bugs are resolved with this release:
[23562] signal: Use correct type for si_band in siginfo_t
[23579] libc: Errors misreported in preadv2
[23709] Fix CPU string flags for Haswell-type CPUs
+ [23927] Linux if_nametoindex() does not close descriptor (CVE-2018-19591)
Version 2.26
diff --git a/sysdeps/unix/sysv/linux/if_index.c b/sysdeps/unix/sysv/linux/if_index.c
index a874634..b620d21 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 | 5 +++++
sysdeps/unix/sysv/linux/if_index.c | 11 ++++++-----
3 files changed, 18 insertions(+), 5 deletions(-)
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