Yeah...this looks like a "big" issue...wonder what the resolution is?....removal?...or just hunker down and wait for a patch/update from the devs?...
On Sat, Mar 30, 2024, 4:08 PM Jeffrey Walton <noloader@xxxxxxxxx> wrote:
On Sat, Mar 30, 2024 at 1:08 PM Dave Ihnat <dihnat@xxxxxxxxxx> wrote:
>
> Didn't see this go by, but it looks hot enough to risk a repeat posting.
> From a friend:
>
> It appears there's been a very serious effort to backdoor sshd on
> Linux via the xz compression/decompression system.
>
> https://www.openwall.com/lists/oss-security/2024/03/29/4
>
> If you have anything running very recent Linux, it's worth investigating
> whether you're affected.
>
> IBM Red Hat says, if you're running Fedora 40 or Fedora Rawhide:
>
> > PLEASE IMMEDIATELY STOP USAGE OF ANY FEDORA
> > RAWHIDE INSTANCES for work or personal activity.
>
> The identity that did this got to the point of being not only an xz
> maintainer but a Linux kernel contributor, and contributed to a number
> of other Open Source projects as well over the course of years. The
> identity may have been compromised to do this, or may have been created
> to do this, and may have used other contributions to build rapport or
> to compromise more projects as well.
>
> I looked at the detection script available at the URL in the posting. It's
> harmless at worst (don't know yet if it can detect anything).
It looks like more analysis has revealed this is a RCE with the
payload in the modulus of a public key: "The payload is extracted from
the N value (the public key) passed to RSA_public_decrypt, checked
against a simple fingerprint, and decrypted with a fixed ChaCha20 key
before the Ed448 signature verification..." Also see
<https://www.openwall.com/lists/oss-security/2024/03/30/36>.
Jeff
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