Sean de Regge discovered that flac did not properly perform bounds
checking in many situations. An attacker could send a specially crafted
FLAC audio file and execute arbitrary code as the user or cause a denial
of service in flac or applications that link against flac.
Alin Rad Pop discovered that CUPS did not correctly validate buffer
lengths when processing IPP tags. Remote attackers successfully
exploiting this vulnerability would gain access to the non-root CUPS user
in Ubuntu 6.06 LTS, 6.10, and 7.04. In Ubuntu 7.10, attackers would be
isolated by the AppArmor CUPS profile.
USN-537-1 fixed vulnerabilities in gnome-screensaver. The fixes were
incomplete, and only reduced the scope of the vulnerability, without
fully solving it. This update fixes related problems in compiz.
Original advisory details:
Jens Askengren discovered that gnome-screensaver became confused when
running under Compiz, and could lose keyboard lock focus. A local attacker
could exploit this to bypass the user's locked screen saver.
It was discovered that libpng did not properly perform bounds checking
and comparisons in certain operations. An attacker could send a specially
crafted PNG image and cause a denial of service in applications linked
against libpng.
Jens Askengren discovered that gnome-screensaver became confused when
running under Compiz, and could lose keyboard lock focus. A local
attacker could exploit this to bypass the user's locked screen saver.
Various flaws were discovered in the layout and JavaScript engines. By
tricking a user into opening a malicious web page, an attacker could
execute arbitrary code with the user's privileges. (CVE-2007-5339,
USN-531-1 fixed vulnerabilities in dhcp. The fixes were incomplete,
and only reduced the scope of the vulnerability, without fully solving
it. This update fixes the problem.
Nahuel Riva and Gerardo Richarte discovered that the DHCP server did not
correctly handle certain client options. A remote attacker could send
malicious DHCP replies to the server and execute arbitrary code.
Various flaws were discovered in the layout and JavaScript engines.
By tricking a user into opening a malicious web page, an attacker could
execute arbitrary code with the user's privileges. (CVE-2007-5336,
CVE-2007-5339, CVE-2007-5340)
USN-501-1 fixed vulnerabilities in Jasper.
It was discovered that Jasper did not correctly handle corrupted JPEG2000
images. By tricking a user into opening a specially crafted JPG, a
remote attacker could cause the application using libjasper to crash,
resulting in a denial of service.
Ludwig Nussel discovered that mount and umount did not properly
drop privileges when using helper programs. Local attackers may be
able to bypass security restrictions and gain root privileges using
programs such as mount.nfs or mount.cifs.
Nobuhiro Ban discovered that check_http in nagios-plugins did
not properly sanitize its input when following redirection
requests. A malicious remote web server could cause a denial
of service or possibly execute arbitrary code as the user.
Nahuel Riva and Gerardo Richarte discovered that the DHCP server did not
correctly handle certain client options. A remote attacker could send
malicious DHCP replies to the server and execute arbitrary code.
It was discovered that the hpssd tool of hplip did not correctly handle
shell meta-characters. A local attacker could exploit this to execute
arbitrary commands as the hplip user.
It was discovered that Tk could be made to overrun a buffer when loading
certain images. If a user were tricked into opening a specially crafted
GIF image, remote attackers could cause a denial of service or execute
arbitrary code with user privileges.
Joris van Rantwijk discovered that the Xen host did not correctly validate
the contents of a Xen guests's grug.conf file. Xen guest root users could
exploit this to run arbitrary commands on the host when the guest system
was rebooted.
Thomas de Grenier de Latour discovered that the checkrestart program included
in debian-goodies did not correctly handle shell meta-characters. A local
attacker could exploit this to gain the privileges of the user running
checkrestart.
Robert Buchholz discovered that libsndfile did not correctly validate the
size of its memory buffers. If a user were tricked into playing a specially
crafted FLAC file, a remote attacker could execute arbitrary code with user
privileges.
An integer overflow was discovered in the TIFF handling code in OpenOffice.
If a user were tricked into loading a malicious TIFF image, a remote attacker
could execute arbitrary code with user privileges.
Multiple vulnerabilities were found in the image decoders of ImageMagick.
If a user or automated system were tricked into processing a malicious
DCM, DIB, XBM, XCF, or XWD image, a remote attacker could execute arbitrary
code with user privileges.
It was discovered that OpenSSL did not correctly perform Montgomery
multiplications. Local attackers might be able to reconstruct RSA
private keys by examining another user's OpenSSL processes.
