source: patches/bzip2-1.0.3-bzgrep_security-1.patch@ ff7d3cd

Submitted By: Ken Moffat <ken@kenmoffat.uklinux.net>
Date: 2005-08-09
Initial Package Version: 1.0.3
Upstream Status: Unknown.
Origin: Jyri Ryska (RedHat) for fedora3
Description: Fixes filename sanitisation in bzgrep.
 This fixes CAN-2005-0758 (if a user can be tricked into running
bzgrep in an untrusted directory containing files with carefully
crafted filenames, arbitrary commands could be executed as the user
running bzgrep).  Risk is reported as low.  I've modified it to force
the interpreter to be bash, some of the other shells in use won't
like the bash syntax.

diff -Naur bzip2-1.0.3/bzgrep bzip2-1.0.3-new/bzgrep
--- bzip2-1.0.3/bzgrep  2004-10-09 12:29:32.000000000 +0100
+++ bzip2-1.0.3-new/bzgrep      2005-08-09 21:36:37.000000000 +0100
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # Bzgrep wrapped for bzip2, 
 # adapted from zgrep by Philippe Troin <phil@fifi.org> for Debian GNU/Linux.
@@ -63,7 +63,11 @@
     bzip2 -cdfq "$i" | $grep $opt "$pat"
     r=$?
   else
-    bzip2 -cdfq "$i" | $grep $opt "$pat" | sed "s|^|${i}:|"
+    j=${i//\\/\\\\}
+    j=${j//|/\\|}
+    j=${j//&/\\&}
+    j=`printf "%s" "$j" | tr '\n' ' '`
+    bzip2 -cdfq "$i" | $grep $opt "$pat" | sed "s|^|${j}:|"
     r=$?
   fi
   test "$r" -ne 0 && res="$r"