Comment 2 for bug 2029464

Hi,

> Do you know if this issue ever got a CVE assigned?
I requested a CVE from MITRE today, awaiting a response.

> Also are you ok with me making this bug public since the fix is already
public and released?
Sure, go ahead.

Thanks,
Bahaa

On Thu, Aug 3, 2023 at 6:44 PM Eduardo Barretto <email address hidden>
wrote:

> Hey,
>
> Thanks for taking the time to report this bug and helping to make Ubuntu
> better.
> Do you know if this issue ever got a CVE assigned?
> Also are you ok with me making this bug public since the fix is already
> public and released?
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/2029464
>
> Title:
> A stack overflow in GNU Tar
>
> Status in tar package in Ubuntu:
> New
>
> Bug description:
> A stack overflow vulnerability exists in GNU Tar up to including v1.34,
> as far as I can see, Ubuntu is using v1.3.
> The bug exists in the function xattr_decoder() in xheader.c, where
> alloca() is used and it may overflow the stack if a sufficiently long xattr
> key is used. The vulnerability can be triggered when extracting a tar/pax
> archive that contains such a long xattr key.
>
> Vulnerable code:
>
> https://git.savannah.gnu.org/cgit/tar.git/tree/src/xheader.c?h=release_1_34#n1723
>
> PoC tar archive is attached in a zip archive to reduce the size.
>
> I reported the vulnerability yesterday to GNU Tar maintainers and they
> replied that the issue was fixed in the version that was released two
> weeks ago:
>
>
> "Sergey fixed that bug here:
>
>
> https://git.savannah.gnu.org/cgit/tar.git/commit/?id=a339f05cd269013fa133d2f148d73f6f7d4247e4
>
> and the fix appears in tar 1.35, released July 18.
> "
>
> To manage notifications about this bug go to:
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>
>