Otkriveno je više sigurnosnih propusta u radu jezgre operacijskog sustava Ubuntu. Napadači ih mogu iskoristiti za izvođenje DoS napada, čitanje i pregled određenih podataka te povećanje ovlasti na ranjivom sustavu.
Paket:
Linux kernel 2.6.x
Operacijski sustavi:
Ubuntu Linux 10.10
Kritičnost:
6
Problem:
neodgovarajuće rukovanje memorijom, pogreška u programskoj komponenti
Iskorištavanje:
lokalno/udaljeno
Posljedica:
dobivanje većih privilegija, otkrivanje osjetljivih informacija, uskraćivanje usluga (DoS)
Propusti su uzrokovani nepravilnošću u linux-ti-omap4, točnije pogreškama u X.25 implementaciji, KSM podršci za povezivanje memorije, nepravilnošću u komponenti NFS Lock Manager, itd. Za više informacija savjetuje se pregled izvornog upozorenja.
Posljedica:
Napadaču omogućuju izvođenje DoS napada, stjecanje većih ovlasti i otkrivanje osjetljivih informacija.
Rješenje:
Korisnicima se preporuča prelazak na ispravljenu inačicu.
==========================================================================
Ubuntu Security Notice USN-1244-1
October 25, 2011
linux-ti-omap4 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 10.10
Summary:
Several security issues were fixed in the kernel.
Software Description:
- linux-ti-omap4: Linux kernel for OMAP4
Details:
Dan Rosenberg discovered that the Linux kernel X.25 implementation
incorrectly parsed facilities. A remote attacker could exploit this to
crash the kernel, leading to a denial of service. (CVE-2010-3873)
Andrea Righi discovered a race condition in the KSM memory merging support.
If KSM was being used, a local attacker could exploit this to crash the
system, leading to a denial of service. (CVE-2011-2183)
Vasily Averin discovered that the NFS Lock Manager (NLM) incorrectly
handled unlock requests. A local attacker could exploit this to cause a
denial of service. (CVE-2011-2491)
Vasiliy Kulikov discovered that taskstats did not enforce access
restrictions. A local attacker could exploit this to read certain
information, leading to a loss of privacy. (CVE-2011-2494)
Vasiliy Kulikov discovered that /proc/PID/io did not enforce access
restrictions. A local attacker could exploit this to read certain
information, leading to a loss of privacy. (CVE-2011-2495)
It was discovered that the wireless stack incorrectly verified SSID
lengths. A local attacker could exploit this to cause a denial of service
or gain root privileges. (CVE-2011-2517)
It was discovered that the EXT4 filesystem contained multiple off-by-one
flaws. A local attacker could exploit this to crash the system, leading to
a denial of service. (CVE-2011-2695)
Christian Ohm discovered that the perf command looks for configuration
files in the current directory. If a privileged user were tricked into
running perf in a directory containing a malicious configuration file, an
attacker could run arbitrary commands and possibly gain privileges.
(CVE-2011-2905)
Vasiliy Kulikov discovered that the Comedi driver did not correctly clear
memory. A local attacker could exploit this to read kernel stack memory,
leading to a loss of privacy. (CVE-2011-2909)
Yogesh Sharma discovered that CIFS did not correctly handle UNCs that had
no prefixpaths. A local attacker with access to a CIFS partition could
exploit this to crash the system, leading to a denial of service.
(CVE-2011-3363)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 10.10:
linux-image-2.6.35-903-omap4 2.6.35-903.26
After a standard system update you need to reboot your computer to make
all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1244-1
CVE-2010-3873, CVE-2011-2183, CVE-2011-2491, CVE-2011-2494,
CVE-2011-2495, CVE-2011-2517, CVE-2011-2695, CVE-2011-2905,
CVE-2011-2909, CVE-2011-3363
Package Information:
https://launchpad.net/ubuntu/+source/linux-ti-omap4/2.6.35-903.26
Posljednje sigurnosne preporuke