Velika sigurnosna rupa na Redhat/Centos?

[serge]

Upravo sam dobio upozorejnje od svog hostinga sa sledecim sadrzajem:

I am writing you tonight to inform you that we have disabled access to port 22 (default SSH port) on your server as temporary precautionary
security measure. Our security team has good reason to believe there is
a root-level exploit in the wild for RedHat/CentOS servers as compromises have been reported on WebHostingTalk, Reddit, as well as on
our own network and at other providers we have talked to. There have
been a number of similarities in the attacks and that is why we have
decided it is best to block this port temporarily until the attack
vector is determined. If you require SSH or SFTP access, we can set it up for
you on an alternate port if you open a Grove ticket. We understand this sudden change is an inconvenience and interruption to your work flow, but we
believe it is in the best interest of your server's security at this time.

We are watching this issue closely and will be taking further
precautionary or preventative measures if needed. Again, we are deeply
sorry for the inconvenience. If you require SSH or SFTP access and you were
using it on port 22 (if you never changed it, this is what it would be) we can change the port and restore access for you if you open a ticket.
We will roll out updates as soon as they are available.

Da li neko zna nesto vise o ovome?

[mangia]

Koja verzija CentOS-a i Kernel-a ?

Znam da je Centos 5.0 po defaultu dolazio sa problematičnim kernelom. I kasnije je par verzija imalo sign. propust gdje lokalni user-u mogu iskoristiti propust da dobiju root pristup serveru.

Postoji i šansa da je par servera kompromitovano pa onda blokirali svima...

U principu ako 100 godina nije update-ovan onda je za očekivati da postoji neki problem.

[webarto]

http://seclists.org/oss-sec/2013/q1/326

[serge]

Ovde se rasparavlja o exploitu.

http://www.webhostingtalk.com/showthread.php?t=1235797

@webarto - samo updateujemo kernel onda?

[mangia]

Po Secuniji http://secunia.com/advisories/52269/ ne radi se o kritčnom propustu ali ispada da nije tako.

Nije dovoljno samo kernel update-ovati. Treba prvo provjeriti da li je uopšte zakrpljen.

Koliko ja vidim, za ovo je potreban lokalni nalog na serveru ili bušna aplikacija preko koje uploaduju neki remote shell.

[serge]

Ako imate fajl /lib64/libkeyutils.so.1.9 onda vam je instaliran sshd rootkit i verovatno saljete spam.

[Nemanja Avramović]

Je l' to Wiredtree? I ja sam dobio identičan mejl :S

[serge]

Originalno napisao Nemanja Avramović

Je l' to Wiredtree? I ja sam dobio identičan mejl :S

Jeste, ali nema veze za samim hosting provajderom kao takvim.

[Nemanja Avramović]

Off Topic: Da da, skontao sam da je problem u RedHat/CentOS-u, nego videh identičan mejl pa sam pretpostavio da je isti hosting provajder.

[mangia]

Jedan lik se javio da ga isto snašlo na SLES-u,...