Izdana je revizija sigurnosnog upozorenja oznake USN-1232-1, prvotno izdanog 18. listopada. U izvornoj preporuci se opisuju nedostaci u programskom paketu xorg-server koji se mogu iskoristiti za otkrivanje osjetljivih informacija, izvođenje DoS (eng. Denial of Service) napada ili pokretanje proizvoljnog programskog koda.
Paket:
xorg-x11-server-utils 7.x
Operacijski sustavi:
Ubuntu Linux 11.10, Ubuntu Linux 10.04, Ubuntu Linux 10.10, Ubuntu Linux 11.04
Nedostaci opisani u izvornoj preporuci su uzrokovani nepravilnom provjerom ulaznih podataka i zaključanim datotekama. Revizija je izdana zbog greške u programskog zakrpi za operacijski sustav Ubuntu 10.04 LTS koja je uzrokovala greške u podršci za GLX.
Posljedica:
Nedostaci se mogu iskoristiti za otkrivanje osjetljivih informacija, izvođenje DoS napada ili izvršavanje zlonamjernog programskog koda.
Rješenje:
Nova programska nadogradnja privremeno onemogućava programsku zakrpu sa greškom. Korisnicima ostalih ranjivih operacijskih sustava savjetuje se primjena nadogradnje ukoliko to još nisu učinili.
==========================================================================
Ubuntu Security Notice USN-1232-2
October 19, 2011
xorg-server regression
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 10.04 LTS
Summary:
USN-1232-1 caused a regression with GLX support.
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.
This update temporarily disables the fix for CVE-2010-4818 that introduced
the regression.
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 10.04 LTS:
xserver-xorg-core 2:1.7.6-2ubuntu7.9
After a standard system update you need to restart your session to make
all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1232-2
http://www.ubuntu.com/usn/usn-1232-1
https://launchpad.net/bugs/877905
Package Information:
https://launchpad.net/ubuntu/+source/xorg-server/2:1.7.6-2ubuntu7.9
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