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GNU C Library master sources branch release/2.24/master updated. glibc-2.24-55-g87bd418
- From: fw at sourceware dot org
- To: glibc-cvs at sourceware dot org
- Date: 19 Jun 2017 16:47:57 -0000
- Subject: GNU C Library master sources branch release/2.24/master updated. glibc-2.24-55-g87bd418
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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=87bd4186da10371f46e2f1a7bf7c0a45bb04f1ac
commit 87bd4186da10371f46e2f1a7bf7c0a45bb04f1ac
Author: Florian Weimer <fweimer@redhat.com>
Date: Mon Jun 19 18:33:26 2017 +0200
CVE-2017-1000366: Ignore LD_LIBRARY_PATH for AT_SECURE=1 programs [BZ #21624]
LD_LIBRARY_PATH can only be used to reorder system search paths, which
is not useful functionality.
This makes an exploitable unbounded alloca in _dl_init_paths unreachable
for AT_SECURE=1 programs.
(cherry picked from commit f6110a8fee2ca36f8e2d2abecf3cba9fa7b8ea7d)
diff --git a/ChangeLog b/ChangeLog
index 1795e28..e37f14f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2017-06-19 Florian Weimer <fweimer@redhat.com>
+
+ [BZ #21624]
+ CVE-2017-1000366
+ * elf/rtld.c (process_envvars): Ignore LD_LIBRARY_PATH for
+ __libc_enable_secure.
+
2017-02-01 Andreas Schwab <schwab@linux-m68k.org>
* sysdeps/m68k/m680x0/m68020/atomic-machine.h
diff --git a/NEWS b/NEWS
index 82a718f..d42af91 100644
--- a/NEWS
+++ b/NEWS
@@ -25,6 +25,7 @@ The following bugs are resolved with this release:
[21289] Fix symbol redirect for fts_set
[21386] Assertion in fork for distinct parent PID is incorrect
+ [21624] Unsafe alloca allows local attackers to alias stack and heap (CVE-2017-1000366)
Version 2.24
diff --git a/elf/rtld.c b/elf/rtld.c
index 647661c..215a9ae 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -2437,7 +2437,8 @@ process_envvars (enum mode *modep)
case 12:
/* The library search path. */
- if (memcmp (envline, "LIBRARY_PATH", 12) == 0)
+ if (!__libc_enable_secure
+ && memcmp (envline, "LIBRARY_PATH", 12) == 0)
{
library_path = &envline[13];
break;
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 7 +++++++
NEWS | 1 +
elf/rtld.c | 3 ++-
3 files changed, 10 insertions(+), 1 deletions(-)
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