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From d74a30d45c6834c8e9f87115197370fe86656d81 Mon Sep 17 00:00:00 2001
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From: Jim Meyering <meyering@fb.com>
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Date: Mon, 4 Apr 2022 23:52:49 -0700
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Subject: zgrep: add NEWS and tests for this exploitable bug
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* tests/zgrep-abuse: New file, based on PoC by cleemy desu wayo.
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* tests/Makefile.am (TESTS): Add it.
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* NEWS: Mention the exploit.
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The bug appears to have been present since the beginning.
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---
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tests/Makefile.am | 1 +
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tests/zgrep-abuse | 41 +++++++++++++++++++++++++++++++++++++++++
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3 files changed, 45 insertions(+)
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create mode 100755 tests/zgrep-abuse
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diff --git a/tests/Makefile.am b/tests/Makefile.am
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index d09672e..5f148d6 100644
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--- a/tests/Makefile.am
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+++ b/tests/Makefile.am
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@@ -36,6 +36,7 @@ TESTS = \
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trailing-nul \
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zdiff \
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zgrep-f \
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+ zgrep-abuse \
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zgrep-signal \
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znew-k
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diff --git a/tests/zgrep-abuse b/tests/zgrep-abuse
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new file mode 100755
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index 0000000..3e8a8f9
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--- /dev/null
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+++ b/tests/zgrep-abuse
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@@ -0,0 +1,41 @@
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+#!/bin/sh
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+# Show how zgrep applied to a crafted file name may overwrite
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+# a selected file with chosen content. Fixed in gzip-1.12.
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+
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+# Copyright (C) 2022 Free Software Foundation, Inc.
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+
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+# This program is free software: you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation, either version 3 of the License, or
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+# (at your option) any later version.
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+
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+# This program is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+# GNU General Public License for more details.
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+
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+# You should have received a copy of the GNU General Public License
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+# along with this program. If not, see <https://www.gnu.org/licenses/>.
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+# limit so don't run it by default.
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+
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+. "${srcdir=.}/init.sh"; path_prepend_ ..
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+
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+: > z || framework_failure_
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+echo test |gzip > 'z|
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+p
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+1s|.*|chosen-content|
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+1w hacked
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+etouch .\x2fhacked2
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+d
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+#
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+#' || framework_failure_
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+
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+fail=0
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+
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+zgrep test z* > /dev/null
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+
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+# Before the fix, each of these would be created.
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+test -f hacked && fail=1
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+test -f hacked2 && fail=1
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+
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+Exit $fail
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--
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cgit v1.1
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