Re: Path Traversal Vulnerability in pg_dump Directory Format

Hi

+        strstr(relativeFilename, "..") != NULL ||

This will also reject a valid unix filename i.e. "blob..1.toc" which
are unrelated to path traversal. Should we care about such file names
here?


Thanks
Imran Zaheer


On Fri, Jul 3, 2026 at 8:07 PM Jonathan Gonzalez V.
<jonathan.abdiel@gmail.com> wrote:
>
>
> Hello!!
>
> Dilip Kumar <dilipbalaut@gmail.com> writes:
> > I would like to submit a patch to address a path traversal
> > vulnerability in pg_dump's directory format mode (-F d). Currently,
> > filenames listed in directory-format TOC files (toc.dat and
> > blobs_*.toc) are treated as trusted when reading an archive during a
> > restore. If an archive entry filename is maliciously modified to
> > contain path traversal elements (such as ..) or directory separators,
> > pg_restore can be tricked into reading files outside the intended
> > backup directory.  The attached patch fixes this vulnerability.
>
> I was taking a look into the patch and, yes it works as expected, but I
> also manage to get the same result of a path traversal having a with a
> symlink as follow:
>
> blob_16388.dat -> ../../../../../../../etc/passwd
>
> Probably it could be worthy to add the symlink check with lstat() ?
>
> Regards,
> --
> Jonathan Gonzalez V.
> EDB
> https://www.enterprisedb.com
>
>