CVE-2012-3481 in GIMP
Summary
by MITRE
Integer overflow in the ReadImage function in plug-ins/common/file-gif-load.c in the GIF image format plug-in in GIMP 2.8.x and earlier allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via crafted height and len properties in a GIF image file, which triggers a heap-based buffer overflow. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 12/12/2021
The vulnerability described in CVE-2012-3481 represents a critical integer overflow flaw within the Graphics Interchange Format (GIF) loading functionality of the GNU Image Manipulation Program (GIMP). This issue affects GIMP versions 2.8.x and earlier, where the ReadImage function in the file-gif-load.c plug-in fails to properly validate input parameters during GIF image parsing. The vulnerability stems from inadequate bounds checking when processing the height and len properties of GIF image files, creating a condition where maliciously crafted values can cause integer arithmetic to wrap around and produce unexpectedly large values. Such overflow conditions are particularly dangerous in memory management contexts where computed values are used to determine buffer allocation sizes, as they can lead to heap-based buffer overflows that compromise system stability and security.
The technical implementation of this vulnerability involves the exploitation of integer overflow conditions within the GIF loading pipeline of GIMP's image processing framework. When a GIF image file is loaded, the ReadImage function processes various header fields including image dimensions and data lengths. The flaw occurs when the height and len properties are manipulated to exceed the maximum representable integer values, causing them to wrap around to negative or extremely large positive values. This overflow directly influences memory allocation decisions, where the system attempts to allocate heap memory based on these corrupted values, resulting in insufficient buffer sizing or excessive allocation that can overwrite adjacent memory regions. The vulnerability is classified under CWE-190 as an Integer Overflow or Wraparound, which is a well-documented weakness in software security that frequently leads to memory corruption vulnerabilities.
The operational impact of this vulnerability extends beyond simple denial of service to potentially enabling remote code execution in affected systems. Attackers can craft specially formatted GIF image files that, when opened by an unsuspecting user, trigger the integer overflow condition and cause the application to crash or potentially execute arbitrary code with the privileges of the user running GIMP. This represents a significant threat in environments where users might encounter malicious image files through email attachments, web browsing, or file sharing platforms. The vulnerability affects the core image processing functionality of GIMP, making it particularly dangerous for graphic designers, photographers, and digital artists who frequently handle image files from various sources. The heap-based buffer overflow that results from this condition can be exploited through various attack vectors including social engineering campaigns where users are tricked into opening malicious GIF files.
From a threat modeling perspective, this vulnerability aligns with ATT&CK techniques related to initial access through malicious files and privilege escalation through application exploitation. The attack surface is particularly broad given that GIMP is widely used across different operating systems and platforms, making the impact of this vulnerability widespread. Security practitioners should note that this vulnerability demonstrates the importance of input validation in image processing libraries and the critical need for proper integer overflow protection in memory management operations. The vulnerability's classification as a heap-based buffer overflow also indicates that it may be susceptible to exploitation techniques involving memory corruption, potentially allowing attackers to manipulate program execution flow through carefully crafted input data.
Mitigation strategies for CVE-2012-3481 primarily focus on immediate software updates and patches provided by the GIMP development team, as well as implementing defensive programming practices in image processing applications. Users should upgrade to GIMP versions that contain the appropriate fixes for this vulnerability, which typically involve proper integer overflow checking and bounds validation in the GIF loading code. Organizations should implement security awareness training to prevent users from opening untrusted image files and consider deploying network-based security controls to filter potentially malicious content. Additionally, the vulnerability highlights the importance of applying security patches promptly and maintaining updated software versions to protect against known exploits. System administrators should also consider implementing application whitelisting policies that restrict the execution of image processing applications to trusted environments where such vulnerabilities can be properly managed through regular patching cycles.