CVE-2013-1439 in libraw
Summary
by MITRE
The "faster LJPEG decoder" in libraw 0.13.x, 0.14.x, and 0.15.x before 0.15.4 allows context-dependent attackers to cause a denial of service (NULL pointer dereference) via a crafted photo file.
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Analysis
by VulDB Data Team • 01/07/2022
The vulnerability identified as CVE-2013-1439 resides within the libraw library's implementation of the faster LJPEG decoder, affecting versions 0.13.x through 0.15.3. This library serves as a critical component for digital camera raw image processing, widely utilized across various applications and operating systems for handling proprietary camera formats. The flaw manifests as a NULL pointer dereference condition that occurs during the decoding process of specific photo files, creating a potential denial of service scenario for systems relying on this library. The vulnerability is context-dependent, meaning attackers must craft specific malformed image files to trigger the condition, making it less straightforward to exploit but still highly concerning for software ecosystems that depend on libraw for image processing tasks.
The technical implementation of this vulnerability stems from inadequate input validation within the LJPEG decoder component of libraw. When processing specially crafted photo files, the decoder fails to properly handle certain edge cases in the bitstream parsing logic, resulting in a scenario where a pointer variable remains uninitialized or set to NULL when subsequent operations attempt to dereference it. This type of flaw falls under the Common Weakness Enumeration category CWE-476, which specifically addresses NULL pointer dereference conditions. The vulnerability demonstrates poor defensive programming practices where the code does not adequately check for null values before attempting to access memory locations, creating a predictable crash condition that can be reliably triggered through crafted input files.
The operational impact of CVE-2013-1439 extends beyond simple denial of service, as it can disrupt critical image processing workflows in applications that depend on libraw. Systems utilizing this library for batch processing of camera raw files, digital asset management platforms, and photo editing software may experience complete service disruption when encountering maliciously crafted images. The vulnerability is particularly concerning in automated processing environments where applications might encounter unexpected input without proper error handling, potentially leading to cascading failures in larger software ecosystems. From an attacker perspective, this vulnerability represents a low-effort method for causing system instability, as it requires only the creation of a specially formatted image file to trigger the condition.
Security practitioners should implement immediate mitigations by upgrading to libraw version 0.15.4 or later, which contains the patched implementation of the LJPEG decoder. Organizations should also consider implementing input validation and sanitization measures at the application level to prevent malformed image files from reaching the vulnerable library functions. The ATT&CK framework categorizes this vulnerability under the T1499.004 technique for "Endpoint Denial of Service" and T1595.001 for "Network Denial of Service" when considering the broader attack surface. Additionally, defensive measures should include monitoring for unusual processing patterns and implementing proper error handling mechanisms to prevent cascading failures when such vulnerabilities are encountered in production environments.