U radu programskog paketa xorg-server uočeno je nekoliko sigurnosnih ranjivosti. Napadaču omogućuju otkrivanje osjetljivih informacija, izvođenje DoS napada ili pokretanje proizvoljnog programskog koda.
Paket:
Operacijski sustavi:
Ubuntu Linux 11.10, Ubuntu Linux 10.04, Ubuntu Linux 10.10, Ubuntu Linux 11.04
Ranjivosti su posljedica neodgovarajućeg rukovanja ulaznim podacima i zaključanim datotekama.
Posljedica:
Napadač ih može iskoristiti za otkrivanje osjetljivih informacija, izvođenje DoS (eng. Denial of Service) napada ili izvršavanje zlonamjernog programskog koda.
Rješenje:
Korisnicima se savjetuje nadogradnja na najnovije inačice.
==========================================================================
Ubuntu Security Notice USN-1232-1
October 18, 2011
xorg-server vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
Summary:
The X server could be made to crash, run programs as an administrator, or
read arbitrary files.
Software Description:
- xorg-server: X.Org X server
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 11.10:
xserver-xorg-core 2:1.10.4-1ubuntu4.1
Ubuntu 11.04:
xserver-xorg-core 2:1.10.1-1ubuntu1.3
Ubuntu 10.10:
xserver-xorg-core 2:1.9.0-0ubuntu7.5
Ubuntu 10.04 LTS:
xserver-xorg-core 2:1.7.6-2ubuntu7.8
After a standard system update you need to restart your session to make
all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1232-1
CVE-2010-4818, CVE-2010-4819, CVE-2011-4028, CVE-2011-4029
Package Information:
https://launchpad.net/ubuntu/+source/xorg-server/2:1.10.4-1ubuntu4.1
https://launchpad.net/ubuntu/+source/xorg-server/2:1.10.1-1ubuntu1.3
https://launchpad.net/ubuntu/+source/xorg-server/2:1.9.0-0ubuntu7.5
https://launchpad.net/ubuntu/+source/xorg-server/2:1.7.6-2ubuntu7.8
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