Objavljena je revizija preporuke oznake USN-1527-1, izvorno izdane 10. kolovoza 2012. godine. U originalnoj preporuci opisani su nedostaci programskog paketa Expat koje napadači mogu iskoristiti za napad uskraćivanjem usluga (DoS).
Paket:
Operacijski sustavi:
Ubuntu Linux 10.04, Ubuntu Linux 11.04, Ubuntu Linux 11.10, Ubuntu Linux 12.04
Kritičnost:
5
Problem:
neodgovarajuće rukovanje datotekama, neodgovarajuće rukovanje memorijom, pogreška u programskoj funkciji
Iskorištavanje:
lokalno/udaljeno
Posljedica:
uskraćivanje usluga (DoS)
Rješenje:
programska zakrpa proizvođača
CVE:
CVE-2012-0876, CVE-2012-1148
Izvorni ID preporuke:
USN-1527-2
Izvor:
Ubuntu
Problem:
Ranjivosti se javljaju zbog nepravilnog ograničavanja kolizija u izračunu hash vrijednosti te memorijskih nepravilnosti pri procesiranju XML (eng. eXtensible Markup Language) datoteka. Revizija upozorenja je izdana zbog objavljivanja odgovarajućih nadogradnji za programski paket xmlrpc-c.
Posljedica:
Napadači bi mogli iskoristiti nedostatke za DoS napad pretjeranim trošenjem procesorskih i memorijskih resursa.
Rješenje:
Svim se korisnicima savjetuje instalacija nadogradnji.
==========================================================================
Ubuntu Security Notice USN-1527-2
September 10, 2012
xmlrpc-c vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.04 LTS
Summary:
XML-RPC for C and C++ could be made to cause a denial of service by consuming
excessive CPU and memory resources.
Software Description:
- xmlrpc-c: Lightweight RPC library based on XML and HTTP
Details:
USN-1527-1 fixed vulnerabilities in Expat. This update provides the
corresponding updates for XML-RPC for C and C++. Both issues described in the
original advisory affected XML-RPC for C and C++ in Ubuntu 10.04 LTS, 11.04,
11.10 and 12.04 LTS.
Original advisory details:
It was discovered that Expat computed hash values without restricting the
ability to trigger hash collisions predictably. If a user or application
linked against Expat were tricked into opening a crafted XML file, an attacker
could cause a denial of service by consuming excessive CPU resources.
(CVE-2012-0876)
Tim Boddy discovered that Expat did not properly handle memory reallocation
when processing XML files. If a user or application linked against Expat were
tricked into opening a crafted XML file, an attacker could cause a denial of
service by consuming excessive memory resources. This issue only affected
Ubuntu 8.04 LTS, 10.04 LTS, 11.04 and 11.10. (CVE-2012-1148)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 12.04 LTS:
libxmlrpc-core-c3 1.16.33-3.1ubuntu5.1
Ubuntu 11.10:
libxmlrpc-core-c3-0 1.16.32-0ubuntu4.1
Ubuntu 11.04:
libxmlrpc-core-c3-0 1.16.32-0ubuntu3.1
Ubuntu 10.04 LTS:
libxmlrpc-core-c3 1.06.27-1ubuntu7.1
After a standard system upgrade you need to restart any applications linked
against XML-RPC for C and C++ to effect the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1527-2
http://www.ubuntu.com/usn/usn-1527-1
CVE-2012-0876, CVE-2012-1148
Package Information:
https://launchpad.net/ubuntu/+source/xmlrpc-c/1.16.33-3.1ubuntu5.1
https://launchpad.net/ubuntu/+source/xmlrpc-c/1.16.32-0ubuntu4.1
https://launchpad.net/ubuntu/+source/xmlrpc-c/1.16.32-0ubuntu3.1
https://launchpad.net/ubuntu/+source/xmlrpc-c/1.06.27-1ubuntu7.1
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