Izdana je revizija sigurnosne preporuke izvorno objavljene 18. listopada 2011. Revizija je vezana uz xorg-server i ispravlja propust kojeg udaljeni napadač može iskoristiti za DoS (eng. Denial of Service) napad i proizvoljno pokretanje programskog koda.
Problem sigurnosti je posljedica neodgovarajuće provjere nekih ulaznih podataka. Revizija je objavljena radi izdavanja novih zakrpa za propust s oznakom CVE-2010-4818.
Posljedica:
Udaljeni napadač navedenu ranjivost može iskoristiti za proizvoljno pokretanje programskog koda i napad uskraćivanjem usluga (DoS).
Rješenje:
Svim korisnicima savjetuje se nadogradnja programskog paketa.
==========================================================================
Ubuntu Security Notice USN-1232-3
October 20, 2011
xorg-server vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 10.10
- Ubuntu 10.04 LTS
Summary:
The X server could be made to crash or run programs as an administrator.
Software Description:
- xorg-server: X.Org X server
Details:
USN-1232-1 fixed vulnerabilities in the X.Org X server. A regression was
found on Ubuntu 10.04 LTS that affected GLX support, and USN-1232-2 was
released to temporarily disable the problematic security fix. This update
includes a revised fix for CVE-2010-4818.
We apologize for the inconvenience.
Original advisory details:
It was discovered that the X server incorrectly handled certain malformed
input. An authorized attacker could exploit this to cause the X server to
crash, leading to a denial or service, or possibly execute arbitrary code
with root privileges. This issue only affected Ubuntu 10.04 LTS and 10.10.
(CVE-2010-4818)
It was discovered that the X server incorrectly handled certain malformed
input. An authorized attacker could exploit this to cause the X server to
crash, leading to a denial or service, or possibly read arbitrary data from
the X server process. This issue only affected Ubuntu 10.04 LTS.
(CVE-2010-4819)
Vladz discovered that the X server incorrectly handled lock files. A local
attacker could use this flaw to determine if a file existed or not.
(CVE-2011-4028)
Vladz discovered that the X server incorrectly handled setting lock file
permissions. A local attacker could use this flaw to gain read permissions
on arbitrary files and view sensitive information. (CVE-2011-4029)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 10.10:
xserver-xorg-core 2:1.9.0-0ubuntu7.6
Ubuntu 10.04 LTS:
xserver-xorg-core 2:1.7.6-2ubuntu7.10
After a standard system update you need to restart your session to make
all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1232-3
http://www.ubuntu.com/usn/usn-1232-1
CVE-2010-4818
Package Information:
https://launchpad.net/ubuntu/+source/xorg-server/2:1.9.0-0ubuntu7.6
https://launchpad.net/ubuntu/+source/xorg-server/2:1.7.6-2ubuntu7.10
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