Objavljena je revizija sigurnosnog upozorenja (USN-1149-1) vezanog uz nedostatke programskog paketa Mozilla Firefox koji su zlonamjernim korisnicima omogućavali pokretanje proizvoljnog programskog koda, otkrivanje osjetljivih informacija i rušenje aplikacije.
Neki od ispravljenih nedostataka vezani su uz loše upravljanje memorijom prilikom prikaza određenih web stranica, cjelobrojno prepisivanje u radu s JavaScript poljima te korupciju memorije u prikazu pojedinih "multipart/x-mixed-replace" slika. Revizija je objavljena zbog ispravka pogreške koja se javila u nadogradnji opisanoj u izvornoj preporuci.
Posljedica:
Udaljeni, zlonamjerni korisnici mogu iskoristiti uočene nedostatke za pokretanje napada uskraćivanja usluge te izvršavanje proizvoljnog programskog koda. Dodatno, moguće je i otkrivanje osjetljivih podataka.
Rješenje:
Svim se korisnicima savjetuje primjena objavljenih rješenja.
==========================================================================
Ubuntu Security Notice USN-1149-2
June 29, 2011
firefox regression
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 10.10
- Ubuntu 10.04 LTS
Summary:
In rare instances, Firefox could have trouble accessing some websites.
Software Description:
- firefox: safe and easy web browser from Mozilla
Details:
USN-1149-1 fixed vulnerabilities in Firefox. Unfortunately, a regression
was introduced that prevented cookies from being stored properly when the
hostname was a single character. This update fixes the problem. We
apologize for the inconvenience.
Original advisory details:
Multiple memory vulnerabilities were discovered in the browser rendering
engine. An attacker could use these to possibly execute arbitrary code with
the privileges of the user invoking Firefox. (CVE-2011-2364, CVE-2011-2365,
CVE-2011-2374, CVE-2011-2376)
Martin Barbella discovered that under certain conditions, viewing a XUL
document while JavaScript was disabled caused deleted memory to be
accessed. An attacker could potentially use this to crash Firefox or
execute arbitrary code with the privileges of the user invoking Firefox.
(CVE-2011-2373)
Jordi Chancel discovered a vulnerability on multipart/x-mixed-replace
images due to memory corruption. An attacker could potentially use this to
crash Firefox or execute arbitrary code with the privileges of the user
invoking Firefox. (CVE-2011-2377)
Chris Rohlf and Yan Ivnitskiy discovered an integer overflow vulnerability
in JavaScript Arrays. An attacker could potentially use this to execute
arbitrary code with the privileges of the user invoking Firefox.
(CVE-2011-2371)
Multiple use-after-free vulnerabilities were discovered. An attacker could
potentially use these to execute arbitrary code with the privileges of the
user invoking Firefox. (CVE-2011-0083, CVE-2011-0085, CVE-2011-2363)
David Chan discovered that cookies did not honor same-origin conventions.
This could potentially lead to cookie data being leaked to a third party.
(CVE-2011-2362)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 10.10:
firefox 3.6.18+build2+nobinonly-0ubuntu0.10.10.2
Ubuntu 10.04 LTS:
firefox 3.6.18+build2+nobinonly-0ubuntu0.10.04.2
After a standard system update you need to restart Firefox to make all the
necessary changes.
References:
http://www.ubuntu.com/usn/usn-1149-2
http://www.ubuntu.com/usn/usn-1149-1
https://launchpad.net/bugs/801778
Package Information:
https://launchpad.net/ubuntu/+source/firefox/3.6.18+build2+nobinonly-0ubuntu0.10.10.2
https://launchpad.net/ubuntu/+source/firefox/3.6.18+build2+nobinonly-0ubuntu0.10.04.2
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