oss-security - minor problem on detect

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Date: Fri, 5 Apr 2024 11:01:59 +0800
From: Lam Bruce <brucelam1982pi@...il.com>
To: oss-security@...ts.openwall.com
Subject: minor problem on detect_sh.bin

Hi,

   I tried detect_sh.bin from the end of
https://www.openwall.com/lists/oss-security/2024/03/29/4
   no out put message, then I figured out to comment out set -eu in
detect_sh.bin.

Here is the modified script, in public domain.
#! /bin/bash

#set -eu
#some variables are likely to be unset in the original detect_sh.bin,
#detect_sh.bin will exit, so please add # before 'set -eu'
#Generally, set -eu is a good idea for scripts(finding bugs, avoid
unintended damage),
#but in this case, it is not. ;-)

# chmod u+x ./detect_sh_2024-04-05.bin
# ./detect_sh_2024-04-05.bin

#Modified by BruceLam on 2024-04-05

# find path to liblzma used by sshd
path=""
sshd_path=$(which sshd)
if [ "" == "$sshd_path" ]; then
    echo 'no sshd here. probably not vulnerable. Good luck :-)'
    exit
else
    path="$(ldd $sshd_path | grep liblzma | grep -o '/[^ ]*')"
fi

# does it even exist?
if [ "$path" == "" ]
then
echo probably not vulnerable
exit
fi

# check for function signature
signature=f30f1efa554889f54c89ce5389fb81e7000000804883ec28488954241848894c2410
if hexdump -ve '1/1 "%.2x"' "$path" | grep -q "$signature"
then
echo probably vulnerable
else
echo probably not vulnerable
fi

#end of script

Use open source, libre software to make to world better, :-)

Best Wishes

Bruce Lam

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