Date: Sat, 10 Apr 2021 13:58:40 -0400 From: Leo Famulari <leo@...ulari.name> To: oss-security@...ts.openwall.com Subject: Re: Risk of local privilege escalation in GNU Guix On Thu, Mar 18, 2021 at 05:27:09PM -0400, Leo Famulari wrote: > # Vulnerability > > The attack consists in having an unprivileged user spawn a build process, for > instance with `guix build`, that makes its build directory world-writable. The > user then creates a hardlink to a root-owned file such as `/etc/shadow` in that > build directory. If the user passed the `--keep-failed` option and the build > eventually fails, the daemon changes ownership of the whole build tree, > including the hardlink, to the user. At that point, the user has write access > to the target file. This is CVE-2021-27851. We are very grateful for the invaluable assistance of CERT/CC in getting this assigned. Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)
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