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58 lines
1.7 KiB
Diff
58 lines
1.7 KiB
Diff
From 3c7cd21290cabdadd72984fb69bc51e64ff1002d Mon Sep 17 00:00:00 2001
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From: Florian Weimer <fweimer@redhat.com>
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Date: Mon, 19 Jun 2017 18:31:27 +0200
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Subject: CVE-2017-1000366: Ignore LD_LIBRARY_PATH for AT_SECURE=1 programs [BZ
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#21624]
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LD_LIBRARY_PATH can only be used to reorder system search paths, which
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is not useful functionality.
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This makes an exploitable unbounded alloca in _dl_init_paths unreachable
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for AT_SECURE=1 programs.
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(cherry picked from commit f6110a8fee2ca36f8e2d2abecf3cba9fa7b8ea7d)
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diff --git a/ChangeLog b/ChangeLog
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index d44aff0a36..14ff8b8bb3 100644
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--- a/ChangeLog
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+++ b/ChangeLog
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@@ -1,3 +1,10 @@
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+2017-06-19 Florian Weimer <fweimer@redhat.com>
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+
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+ [BZ #21624]
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+ CVE-2017-1000366
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+ * elf/rtld.c (process_envvars): Ignore LD_LIBRARY_PATH for
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+ __libc_enable_secure.
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+
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2017-05-12 Florian Weimer <fweimer@redhat.com>
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[BZ #21386]
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diff --git a/NEWS b/NEWS
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index d52872323d..29079e8586 100644
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--- a/NEWS
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+++ b/NEWS
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@@ -15,6 +15,7 @@ The following bugs are resolved with this release:
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[21115] sunrpc: Use-after-free in error path in clntudp_call
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[21289] Fix symbol redirect for fts_set
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[21386] Assertion in fork for distinct parent PID is incorrect
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+ [21624] Unsafe alloca allows local attackers to alias stack and heap (CVE-2017-1000366)
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Version 2.25
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diff --git a/elf/rtld.c b/elf/rtld.c
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index a036ece956..2fc33a6178 100644
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--- a/elf/rtld.c
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+++ b/elf/rtld.c
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@@ -2418,7 +2418,8 @@ process_envvars (enum mode *modep)
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case 12:
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/* The library search path. */
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- if (memcmp (envline, "LIBRARY_PATH", 12) == 0)
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+ if (!__libc_enable_secure
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+ && memcmp (envline, "LIBRARY_PATH", 12) == 0)
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{
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library_path = &envline[13];
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break;
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--
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2.13.1
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