On Tue, Jan 9, 2024 at 12:45 AM Harry Sintonen <ha...@sintonen.fi> wrote: > > On Mon, 8 Jan 2024, Georgi Guninski wrote: > > > When extracting archives cpio (at least version 2.13) preserves > > the setuid flag, which might lead to privilege escalation. > > So does for example tar. The same rules that apply to tar also apply to > cpio: >
Hi, thanks for the feedback :) Which version of tar is vulnerable to this attack? I am pretty sure this was fixed in tar and zip `long long` ago. tar and zip on fedora 38 are definitely not vulnerable, they clear the setuid bit. I continue to suspect this is vulnerability because: 1. There is directory traversal protection for untrusted archives 2. tar and zip and not vulnerable bash script for setuid files in tar: #!/bin/bash mkdir -p /tmp/1 ; cd /tmp/1 ; :> a chmod 4755 a ; tar cvf a.tar a mkdir -p /tmp/2 ; cd /tmp/2 ; tar xvf /tmp/1/a.tar ls -lh /tmp/1/a #-rwsr-xr-x. 1 joro joro 0 Jan 9 06:13 /tmp/1/a #original setuid ls -lh /tmp/2/a #-rwxr-xr-x. 1 joro joro 0 Jan 9 06:13 /tmp/2/a #NOT setuid _______________________________________________ Sent through the Full Disclosure mailing list https://nmap.org/mailman/listinfo/fulldisclosure Web Archives & RSS: https://seclists.org/fulldisclosure/
