U radu paketa expat otkrivena su dva sigurnosna propusta koje zlonamjerni korisnici mogu iskoristiti za napad uskraćivanja usluge (eng. Denial of Service).
Paket:
expat 2.x
Operacijski sustavi:
Ubuntu Linux 8.04, 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-1527-1
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.
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-1527-1
August 10, 2012
expat 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
- Ubuntu 8.04 LTS
Summary:
Expat could be made to cause a denial of service by consuming excessive CPU
and memory resources.
Software Description:
- expat: XML parsing C library - example application
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:
lib64expat1 2.0.1-7.2ubuntu1.1
libexpat1 2.0.1-7.2ubuntu1.1
libexpat1-udeb 2.0.1-7.2ubuntu1.1
Ubuntu 11.10:
lib64expat1 2.0.1-7ubuntu3.11.10.1
libexpat1 2.0.1-7ubuntu3.11.10.1
libexpat1-udeb 2.0.1-7ubuntu3.11.10.1
Ubuntu 11.04:
lib64expat1 2.0.1-7ubuntu3.11.04.1
libexpat1 2.0.1-7ubuntu3.11.04.1
libexpat1-udeb 2.0.1-7ubuntu3.11.04.1
Ubuntu 10.04 LTS:
lib64expat1 2.0.1-7ubuntu1.1
libexpat1 2.0.1-7ubuntu1.1
libexpat1-udeb 2.0.1-7ubuntu1.1
Ubuntu 8.04 LTS:
lib64expat1 2.0.1-0ubuntu1.2
libexpat1 2.0.1-0ubuntu1.2
libexpat1-udeb 2.0.1-0ubuntu1.2
After a standard system upgrade you need to restart any applications linked
against Expat to effect the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1527-1
CVE-2012-0876, CVE-2012-1148
Package Information:
https://launchpad.net/ubuntu/+source/expat/2.0.1-7.2ubuntu1.1
https://launchpad.net/ubuntu/+source/expat/2.0.1-7ubuntu3.11.10.1
https://launchpad.net/ubuntu/+source/expat/2.0.1-7ubuntu3.11.04.1
https://launchpad.net/ubuntu/+source/expat/2.0.1-7ubuntu1.1
https://launchpad.net/ubuntu/+source/expat/2.0.1-0ubuntu1.2
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