iDefense reports:
The vulnerability specifically exists due to Opera
improperly processing a JPEG DHT marker. The DHT marker is
used to define a Huffman Table which is used for decoding
the image data. An invalid number of index bytes in the
DHT marker will trigger a heap overflow with partially
user controlled data.
Exploitation of this vulnerability would allow an
attacker to execute arbitrary code on the affected
host. The attacker would first need to construct a website
containing the malicious image and trick the vulnerable
user into visiting the site. This would trigger the
vulnerability and allow the code to execute with the
privileges of the local user.
A flaw exists within Opera's Javascript SVG
implementation. When processing a
createSVGTransformFromMatrix request Opera does not
properly validate the type of object passed to the
function. Passing an incorrect object to this function can
result in it using a pointer that is user controlled when
it attempts to make the virtual function call.
Exploitation of this vulnerability would allow an
attacker to execute arbitrary code on the affected
host. The attacker would first need to construct a website
containing the malicious JavaScript and trick the
vulnerable user into visiting the site. This would trigger
the vulnerability and allow the code to execute with the
privileges of the local user.