CVE-2018-5806 in LibRaw
Summary
by MITRE
An error within the "leaf_hdr_load_raw()" function (internal/dcraw_common.cpp) in LibRaw versions prior to 0.18.8 can be exploited to trigger a NULL pointer dereference.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 06/13/2023
The vulnerability identified as CVE-2018-5806 resides within the LibRaw library, a widely used open-source software for processing raw image files from digital cameras. This library serves as a critical component in numerous image processing applications, digital asset management systems, and photography software platforms. The flaw manifests in the "leaf_hdr_load_raw()" function located in the internal/dcraw_common.cpp file, which handles the loading and processing of raw image data from specific camera models. This particular function is responsible for parsing and interpreting header information from leaf camera raw files, making it a crucial element in the image processing pipeline.
The technical nature of this vulnerability stems from a NULL pointer dereference condition that occurs when the function attempts to access memory locations without proper validation of pointer states. When processing malformed or specially crafted raw image files, the function fails to adequately check whether certain pointers have been properly initialized before attempting to dereference them. This condition creates a scenario where the program attempts to access memory at address zero or an invalid memory location, resulting in an application crash or potential denial of service condition. The vulnerability is classified as a classic null pointer dereference issue that can be exploited through input manipulation, making it particularly dangerous in environments where the library processes untrusted image data from external sources.
The operational impact of this vulnerability extends beyond simple application instability, as it can be leveraged by malicious actors to disrupt services or potentially escalate privileges. When exploited, the NULL pointer dereference can cause the affected application to crash, leading to denial of service conditions that may impact legitimate users. In scenarios where the vulnerable library is embedded within web applications or content management systems that process user-uploaded images, attackers could craft malicious raw image files designed to trigger this vulnerability. The implications are particularly severe in enterprise environments where image processing services are critical to business operations, as the vulnerability could be used to disrupt workflows or gain unauthorized access to systems through service disruption attacks.
Mitigation strategies for CVE-2018-5806 primarily focus on upgrading to LibRaw version 0.18.8 or later, which contains the necessary patches to address the NULL pointer dereference issue. System administrators should prioritize updating their installations to ensure protection against this vulnerability, particularly in environments processing untrusted image data. Additional defensive measures include implementing proper input validation and sanitization protocols, deploying network segmentation to limit exposure, and establishing robust monitoring systems to detect potential exploitation attempts. The vulnerability aligns with CWE-476, which specifically addresses NULL pointer dereference conditions, and can be mapped to ATT&CK technique T1499.004 for denial of service attacks. Organizations should also consider implementing application whitelisting and sandboxing techniques to further reduce the attack surface, as these approaches can help prevent exploitation even if other security controls are bypassed. Regular security assessments and vulnerability scanning should be conducted to ensure comprehensive protection against similar issues in the broader software ecosystem.