U programskom paketu Ghostscript otkriveno je nekoliko sigurnosnih propusta koji se mogu iskoristiti za udaljeno izvođenje DoS napada i pokretanje proizvoljnog programskog koda.
Paket:
ghostscript 8.x
Operacijski sustavi:
Ubuntu Linux 8.04, Ubuntu Linux 10.04, Ubuntu Linux 10.10
Propusti su uzrokovani nepravilnim rukovanjem memorijom, a mogu rezultirati cjelobrojnim prepisivanjem ili preljevom međuspremnika.
Posljedica:
Udaljeni napadač može iskoristiti propuste navodeći korisnika na otvaranje posebno oblikovane JPEG-2000 slike ili dokumenta s posebno oblikovanim TrueType ili Type 2 fontom. Napad može rezultirati rušenjem aplikacije i pokretanjem proizvoljnog programskog koda.
Rješenje:
Svim korisnicima savjetuje se korištenje dostupne programske nadogradnje.
==========================================================================
Ubuntu Security Notice USN-1317-1
January 04, 2012
ghostscript vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 10.10
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS
Summary:
Ghostscript could be made to crash or run programs as your login if it
opened a specially crafted file.
Software Description:
- ghostscript: The GPL Ghostscript PostScript/PDF interpreter
Details:
It was discovered that Ghostscript did not correctly handle memory
allocation when parsing certain malformed JPEG-2000 images. If a user or
automated system were tricked into opening a specially crafted image, an
attacker could cause a denial of service and possibly execute arbitrary
code with user privileges. (CVE-2008-3520)
It was discovered that Ghostscript did not correctly handle certain
formatting operations when parsing JPEG-2000 images. If a user or automated
system were tricked into opening a specially crafted image, an attacker
could cause a denial of service and possibly execute arbitrary code with
user privileges. (CVE-2008-3522)
It was discovered that Ghostscript incorrectly handled certain malformed
TrueType fonts. If a user or automated system were tricked into opening a
document containing a specially crafted font, an attacker could cause a
denial of service and possibly execute arbitrary code with user privileges.
This issue only affected Ubuntu 8.04 LTS. (CVE-2009-3743)
It was discovered that Ghostscript incorrectly handled certain malformed
Type 2 fonts. If a user or automated system were tricked into opening a
document containing a specially crafted font, an attacker could cause a
denial of service and possibly execute arbitrary code with user privileges.
This issue only affected Ubuntu 8.04 LTS. (CVE-2010-4054)
Jonathan Foote discovered that Ghostscript incorrectly handled certain
malformed JPEG-2000 image files. If a user or automated system were tricked
into opening a specially crafted JPEG-2000 image file, an attacker could
cause Ghostscript to crash or possibly execute arbitrary code with user
privileges. (CVE-2011-4516, CVE-2011-4517)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 10.10:
libgs8 8.71.dfsg.2-0ubuntu7.1
Ubuntu 10.04 LTS:
libgs8 8.71.dfsg.1-0ubuntu5.4
Ubuntu 8.04 LTS:
libgs8 8.61.dfsg.1-1ubuntu3.4
In general, a standard system update will make all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1317-1
CVE-2008-3520, CVE-2008-3522, CVE-2009-3743, CVE-2010-4054,
CVE-2011-4516, CVE-2011-4517
Package Information:
https://launchpad.net/ubuntu/+source/ghostscript/8.71.dfsg.2-0ubuntu7.1
https://launchpad.net/ubuntu/+source/ghostscript/8.71.dfsg.1-0ubuntu5.4
https://launchpad.net/ubuntu/+source/ghostscript/8.61.dfsg.1-1ubuntu3.4
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