SID 1:46667

Rule Category

FILE-IMAGE -- Snort detected suspicious traffic targeting vulnerabilities found inside images files, regardless of delivery method, targeted software, or image type. (Examples include: jpg, png, gif, bmp). These rules search for malformed images used to exploit system. Attackers alter image attributes, often to include shell code, so they are susceptible to vulnerabilities when they are parsed and send commands instead of loading the image.

Alert Message

FILE-IMAGE Adobe Acrobat Pro EMF file EMR_STRETCHDIBITS heap overflow attempt

Rule Explanation

This event is generated when a malformed EMF image is detected traversing the network Impact: Attempted User Privilege Gain Details: This vulnerability is an instance of a heap overflow vulnerability in the image conversion engine when handling Enhanced Metafile Format (EMF) data related to pixel block transfer. In particular, the vulnerability is triggered by a crafted EMF file with invalid specification of the source rectangle with respect to the bitmap buffer header information which causes an out of bounds memory access, due to improper bounds checking when manipulating an array pointer. Attackers can exploit the vulnerability by using the out of bounds access for unintended writes potentially leading to code corruption, control-flow hijack, or information leak attack. Ease of Attack:

What To Look For

No information provided

Known Usage

No public information

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group