mirror of
git://slackware.nl/current.git
synced 2024-12-28 09:59:53 +01:00
2be63df823
a/kernel-firmware-20220413_8a2d811-noarch-1.txz: Upgraded.
a/sysvinit-3.03-x86_64-1.txz: Upgraded.
a/xz-5.2.5-x86_64-4.txz: Rebuilt.
This update fixes a security issue:
xzgrep applied to a crafted file name with two or more newlines can no
longer overwrite an arbitrary, attacker-selected file.
For more information, see:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-1271
(* Security fix *)
d/git-2.35.3-x86_64-1.txz: Upgraded.
This update fixes a security issue where a Git worktree created by another
user might be able to execute arbitrary code.
For more information, see:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-24765
(* Security fix *)
l/libaio-0.3.113-x86_64-1.txz: Upgraded.
l/tevent-0.12.0-x86_64-1.txz: Upgraded.
n/php-7.4.29-x86_64-1.txz: Upgraded.
extra/php81/php81-8.1.5-x86_64-1.txz: Upgraded.
94 lines
3.4 KiB
Diff
94 lines
3.4 KiB
Diff
From 69d1b3fc29677af8ade8dc15dba83f0589cb63d6 Mon Sep 17 00:00:00 2001
|
|
From: Lasse Collin <lasse.collin@tukaani.org>
|
|
Date: Tue, 29 Mar 2022 19:19:12 +0300
|
|
Subject: [PATCH] xzgrep: Fix escaping of malicious filenames (ZDI-CAN-16587).
|
|
|
|
Malicious filenames can make xzgrep to write to arbitrary files
|
|
or (with a GNU sed extension) lead to arbitrary code execution.
|
|
|
|
xzgrep from XZ Utils versions up to and including 5.2.5 are
|
|
affected. 5.3.1alpha and 5.3.2alpha are affected as well.
|
|
This patch works for all of them.
|
|
|
|
This bug was inherited from gzip's zgrep. gzip 1.12 includes
|
|
a fix for zgrep.
|
|
|
|
The issue with the old sed script is that with multiple newlines,
|
|
the N-command will read the second line of input, then the
|
|
s-commands will be skipped because it's not the end of the
|
|
file yet, then a new sed cycle starts and the pattern space
|
|
is printed and emptied. So only the last line or two get escaped.
|
|
|
|
One way to fix this would be to read all lines into the pattern
|
|
space first. However, the included fix is even simpler: All lines
|
|
except the last line get a backslash appended at the end. To ensure
|
|
that shell command substitution doesn't eat a possible trailing
|
|
newline, a colon is appended to the filename before escaping.
|
|
The colon is later used to separate the filename from the grep
|
|
output so it is fine to add it here instead of a few lines later.
|
|
|
|
The old code also wasn't POSIX compliant as it used \n in the
|
|
replacement section of the s-command. Using \<newline> is the
|
|
POSIX compatible method.
|
|
|
|
LC_ALL=C was added to the two critical sed commands. POSIX sed
|
|
manual recommends it when using sed to manipulate pathnames
|
|
because in other locales invalid multibyte sequences might
|
|
cause issues with some sed implementations. In case of GNU sed,
|
|
these particular sed scripts wouldn't have such problems but some
|
|
other scripts could have, see:
|
|
|
|
info '(sed)Locale Considerations'
|
|
|
|
This vulnerability was discovered by:
|
|
cleemy desu wayo working with Trend Micro Zero Day Initiative
|
|
|
|
Thanks to Jim Meyering and Paul Eggert discussing the different
|
|
ways to fix this and for coordinating the patch release schedule
|
|
with gzip.
|
|
---
|
|
src/scripts/xzgrep.in | 20 ++++++++++++--------
|
|
1 file changed, 12 insertions(+), 8 deletions(-)
|
|
|
|
diff --git a/src/scripts/xzgrep.in b/src/scripts/xzgrep.in
|
|
index b180936..e5186ba 100644
|
|
--- a/src/scripts/xzgrep.in
|
|
+++ b/src/scripts/xzgrep.in
|
|
@@ -180,22 +180,26 @@ for i; do
|
|
{ test $# -eq 1 || test $no_filename -eq 1; }; then
|
|
eval "$grep"
|
|
else
|
|
+ # Append a colon so that the last character will never be a newline
|
|
+ # which would otherwise get lost in shell command substitution.
|
|
+ i="$i:"
|
|
+
|
|
+ # Escape & \ | and newlines only if such characters are present
|
|
+ # (speed optimization).
|
|
case $i in
|
|
(*'
|
|
'* | *'&'* | *'\'* | *'|'*)
|
|
- i=$(printf '%s\n' "$i" |
|
|
- sed '
|
|
- $!N
|
|
- $s/[&\|]/\\&/g
|
|
- $s/\n/\\n/g
|
|
- ');;
|
|
+ i=$(printf '%s\n' "$i" | LC_ALL=C sed 's/[&\|]/\\&/g; $!s/$/\\/');;
|
|
esac
|
|
- sed_script="s|^|$i:|"
|
|
+
|
|
+ # $i already ends with a colon so don't add it here.
|
|
+ sed_script="s|^|$i|"
|
|
|
|
# Fail if grep or sed fails.
|
|
r=$(
|
|
exec 4>&1
|
|
- (eval "$grep" 4>&-; echo $? >&4) 3>&- | sed "$sed_script" >&3 4>&-
|
|
+ (eval "$grep" 4>&-; echo $? >&4) 3>&- |
|
|
+ LC_ALL=C sed "$sed_script" >&3 4>&-
|
|
) || r=2
|
|
exit $r
|
|
fi >&3 5>&-
|
|
--
|
|
2.35.1
|
|
|