Objavljena je revizija sigurnosnog upozorenja izvorne oznake USN-1197-1 u kojoj je ispravljeno pogrešno rukovanje certifikatima u programskim paketima Mozilla Firefox te Xulrunner. Spomenut je propust zlonamjernim korisnicima omogućavao pokretanje tzv. MITM (eng. man-in-the-middle) napada. Ova je inačica revizije vezana uz programski paket Network Security Service library (libnss).
Paket:
libnss 3.x
Operacijski sustavi:
Ubuntu Linux 10.04, Ubuntu Linux 10.10, Ubuntu Linux 11.04
Problem:
nepravilno rukovanje ovlastima
Iskorištavanje:
udaljeno
Posljedica:
izmjena podataka
Rješenje:
programska zakrpa proizvođača
Izvorni ID preporuke:
USN-1197-4
Izvor:
Ubuntu
Problem:
Riječ je o pogrešnom upravljanju sigurnosnim certifikatima potpisanim od strane nizozemskog autoritativnog tijela DigiNotar.
Posljedica:
Zlonamjerni korisnici mogu iskoristiti neispravne certifikate za pokretanje MITM (eng. man-in-the-middle) napada.
Rješenje:
Svim se korisnicima savjetuje primjena nadogradnje.
==========================================================================
Ubuntu Security Notice USN-1197-4
September 08, 2011
nss vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
Summary:
A certificate authority mis-issued fraudulent certificates.
Software Description:
- nss: Network Security Service libraries
Details:
USN-1197-1 and USN-1197-3 addressed an issue in Firefox and Xulrunner
pertaining to the Dutch Certificate Authority DigiNotar mis-issuing
fraudulent certificates. This update provides the corresponding update
for the Network Security Service libraries (NSS).
Original advisory details:
USN-1197-1
It was discovered that Dutch Certificate Authority DigiNotar, had
mis-issued multiple fraudulent certificates. These certificates could allow
an attacker to perform a "man in the middle" (MITM) attack which would make
the user believe their connection is secure, but is actually being
monitored.
For the protection of its users, Mozilla has removed the DigiNotar
certificate. Sites using certificates issued by DigiNotar will need to seek
another certificate vendor.
We are currently aware of a regression that blocks one of two Staat der
Nederlanden root certificates which are believed to still be secure. This
regression is being tracked at https://launchpad.net/bugs/838322.
USN-1197-3
USN-1197-1 partially addressed an issue with Dutch Certificate Authority
DigiNotar mis-issuing fraudulent certificates. This update actively
distrusts the DigiNotar root certificate as well as several intermediary
certificates. Also included in this list of distrusted certificates are the
"PKIOverheid" (PKIGovernment) intermediates under DigiNotar's control that
did not chain to DigiNotar's root and were not previously blocked.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 11.04:
libnss3 3.12.9+ckbi-1.82-0ubuntu2.1
Ubuntu 10.10:
libnss3-1d 3.12.9+ckbi-1.82-0ubuntu0.10.10.3
Ubuntu 10.04 LTS:
libnss3-1d 3.12.9+ckbi-1.82-0ubuntu0.10.04.3
After a standard system update you need to restart any applications that
use NSS, such as Thunderbird or Evolution, to make all the necessary
changes.
References:
http://www.ubuntu.com/usn/usn-1197-4
http://www.ubuntu.com/usn/usn-1197-1
http://www.ubuntu.com/usn/usn-1197-3, https://launchpad.net/bugs/837557
Package Information:
https://launchpad.net/ubuntu/+source/nss/3.12.9+ckbi-1.82-0ubuntu2.1
https://launchpad.net/ubuntu/+source/nss/3.12.9+ckbi-1.82-0ubuntu0.10.10.3
https://launchpad.net/ubuntu/+source/nss/3.12.9+ckbi-1.82-0ubuntu0.10.04.3
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