CVE-2017-7593 in LibTIFF
Summary
by MITRE
tif_read.c in LibTIFF 4.0.7 does not ensure that tif_rawdata is properly initialized, which might allow remote attackers to obtain sensitive information from process memory via a crafted image.
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Analysis
by VulDB Data Team • 11/27/2022
The vulnerability identified as CVE-2017-7593 resides within the LibTIFF library version 4.0.7, specifically in the tif_read.c component responsible for reading TIFF image files. This flaw represents a critical security issue that stems from improper memory initialization practices during the image processing workflow. The vulnerability manifests when the library fails to adequately initialize the tif_rawdata buffer, creating a potential pathway for information disclosure attacks that could expose sensitive data from adjacent memory regions.
The technical implementation of this vulnerability involves the library's handling of raw image data buffers during the reading process. When processing malformed or crafted TIFF files, the tif_rawdata pointer may not be properly initialized before being used, leading to the exposure of uninitialized memory contents. This uninitialized memory could contain remnants of previous data structures, cryptographic keys, user credentials, or other sensitive information that was previously stored in the same memory locations. The flaw operates at the memory management level and directly violates proper initialization practices that should ensure all data buffers are properly set before use.
From an operational perspective, this vulnerability creates significant risk for systems that process untrusted TIFF image files from external sources. Remote attackers can craft malicious TIFF files that trigger the uninitialized memory access when processed by applications relying on LibTIFF 4.0.7. The impact extends beyond simple information disclosure as the leaked memory contents could potentially include session tokens, encryption keys, or other confidential data that could be leveraged for further attacks. This vulnerability aligns with CWE-457: Use of Uninitialized Variable, which specifically addresses the security implications of using variables that have not been properly initialized.
The attack surface for this vulnerability is particularly concerning given the widespread use of LibTIFF across numerous applications and systems including image processing software, web applications, and document management systems. Security researchers have classified this issue as a remote code execution risk in certain contexts, as the leaked memory information could potentially be used to bypass security mechanisms or aid in more sophisticated attacks. The ATT&CK framework categorizes this type of vulnerability under initial access and privilege escalation techniques, where information disclosure serves as a foundational step for more comprehensive attacks.
Organizations should prioritize immediate patching of affected systems and implement additional protective measures such as input validation and file format sanitization. The recommended mitigation strategy includes updating to LibTIFF version 4.0.8 or later where this vulnerability has been addressed through proper memory initialization procedures. Additionally, implementing network segmentation and application whitelisting can help reduce the attack surface while patches are deployed. Security monitoring should focus on detecting attempts to process suspicious image files and anomalous memory access patterns that might indicate exploitation attempts.