U radu jezgre operacijskog sustava Ubuntu uočene su višestruke sigurnosne ranjivosti. Napadaču omogućuju otkrivanje osjetljivih informacija, izvođenje DoS napada te stjecanje povećanih ovlasti.
Paket:
Linux kernel 2.6.x
Operacijski sustavi:
Ubuntu Linux 8.04
Kritičnost:
6.3
Problem:
pogreška u programskoj funkciji, pogreška u programskoj komponenti
Iskorištavanje:
lokalno/udaljeno
Posljedica:
dobivanje većih privilegija, otkrivanje osjetljivih informacija, uskraćivanje usluga (DoS)
Bitnije su ranjivosti posljedica pogrešaka u /proc datotečnom sustavu, funkciji "dccp_rcv_state_process()" i Bluetooth podsustavu. Za više detalja savjetuje se čitanje izvorne preporuke.
Posljedica:
Napadač ih može iskoristiti za stjecanje povećanih ovlasti, otkrivanje osjetljivih podataka i izvođenje napada uskraćivanja usluge.
Rješenje:
Korisnicima se preporuča instalacija novih programskih rješenja.
==========================================================================
Ubuntu Security Notice USN-1189-1
August 19, 2011
linux vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 8.04 LTS
Summary:
Multiple kernel flaws were fixed.
Software Description:
- linux: Linux kernel
Details:
It was discovered that the /proc filesystem did not correctly handle
permission changes when programs executed. A local attacker could hold open
files to examine details about programs running with higher privileges,
potentially increasing the chances of exploiting additional
vulnerabilities. (CVE-2011-1020)
Vasiliy Kulikov discovered that the Bluetooth stack did not correctly clear
memory. A local attacker could exploit this to read kernel stack memory,
leading to a loss of privacy. (CVE-2011-1078)
Vasiliy Kulikov discovered that the Bluetooth stack did not correctly check
that device name strings were NULL terminated. A local attacker could
exploit this to crash the system, leading to a denial of service, or leak
contents of kernel stack memory, leading to a loss of privacy.
(CVE-2011-1079)
Vasiliy Kulikov discovered that bridge network filtering did not check that
name fields were NULL terminated. A local attacker could exploit this to
leak contents of kernel stack memory, leading to a loss of privacy.
(CVE-2011-1080)
Johan Hovold discovered that the DCCP network stack did not correctly
handle certain packet combinations. A remote attacker could send specially
crafted network traffic that would crash the system, leading to a denial of
service. (CVE-2011-1093)
Peter Huewe discovered that the TPM device did not correctly initialize
memory. A local attacker could exploit this to read kernel heap memory
contents, leading to a loss of privacy. (CVE-2011-1160)
Dan Rosenberg discovered that the IRDA subsystem did not correctly check
certain field sizes. If a system was using IRDA, a remote attacker could
send specially crafted traffic to crash the system or gain root privileges.
(CVE-2011-1180)
Dan Rosenberg discovered that the X.25 Rose network stack did not correctly
handle certain fields. If a system was running with Rose enabled, a remote
attacker could send specially crafted traffic to gain root privileges.
(CVE-2011-1493)
It was discovered that Bluetooth l2cap and rfcomm did not correctly
initialize structures. A local attacker could exploit this to read portions
of the kernel stack, leading to a loss of privacy. (CVE-2011-2492)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 8.04 LTS:
linux-image-2.6.24-29-386 2.6.24-29.93
linux-image-2.6.24-29-generic 2.6.24-29.93
linux-image-2.6.24-29-hppa32 2.6.24-29.93
linux-image-2.6.24-29-hppa64 2.6.24-29.93
linux-image-2.6.24-29-itanium 2.6.24-29.93
linux-image-2.6.24-29-lpia 2.6.24-29.93
linux-image-2.6.24-29-lpiacompat 2.6.24-29.93
linux-image-2.6.24-29-mckinley 2.6.24-29.93
linux-image-2.6.24-29-openvz 2.6.24-29.93
linux-image-2.6.24-29-powerpc 2.6.24-29.93
linux-image-2.6.24-29-powerpc-smp 2.6.24-29.93
linux-image-2.6.24-29-powerpc64-smp 2.6.24-29.93
linux-image-2.6.24-29-rt 2.6.24-29.93
linux-image-2.6.24-29-server 2.6.24-29.93
linux-image-2.6.24-29-sparc64 2.6.24-29.93
linux-image-2.6.24-29-sparc64-smp 2.6.24-29.93
linux-image-2.6.24-29-virtual 2.6.24-29.93
linux-image-2.6.24-29-xen 2.6.24-29.93
After a standard system update you need to reboot your computer to make
all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1189-1
CVE-2011-1020, CVE-2011-1078, CVE-2011-1079, CVE-2011-1080,
CVE-2011-1093, CVE-2011-1160, CVE-2011-1180, CVE-2011-1493,
CVE-2011-2492
Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.24-29.93
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