CVE-2017-17787 in GIMP
Summary
by MITRE
In GIMP 2.8.22, there is a heap-based buffer over-read in read_creator_block in plug-ins/common/file-psp.c.
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Analysis
by VulDB Data Team • 01/18/2023
The vulnerability identified as CVE-2017-17787 represents a critical heap-based buffer over-read condition affecting GIMP version 2.8.22. This flaw exists within the file-psp.c plugin module, specifically within the read_creator_block function that processes Paint Shop Pro file format imports. The issue arises when the application attempts to read data from memory locations beyond the allocated buffer boundaries, creating a potential pathway for memory corruption and arbitrary code execution. Such vulnerabilities are particularly dangerous as they can be exploited by attackers who craft malicious Paint Shop Pro files to trigger the vulnerable code path during image import operations.
The technical implementation of this vulnerability stems from inadequate bounds checking within the read_creator_block function. When processing proprietary PSP file structures, the application fails to properly validate the size of data segments before attempting to read them into fixed-size buffers. This allows an attacker to provide malformed input data that exceeds the expected buffer limits, causing the program to read beyond allocated memory regions. The heap-based nature of the over-read indicates that the vulnerable memory allocation occurs on the heap rather than the stack, making exploitation more complex but potentially more reliable in certain execution environments. This vulnerability directly maps to CWE-125, which describes out-of-bounds read conditions in software implementations, and represents a classic example of memory safety issues that have plagued image processing applications for decades.
The operational impact of CVE-2017-17787 extends beyond simple memory corruption, as it creates opportunities for attackers to execute arbitrary code with the privileges of the affected user. When a user opens a maliciously crafted PSP file, the application crashes or behaves unpredictably, potentially allowing remote code execution. This vulnerability affects the core functionality of GIMP's file import capabilities, making it particularly dangerous for users who frequently work with third-party image files or receive images from untrusted sources. The exploitation vector is relatively straightforward since it only requires the user to open a specially crafted file, making it an attractive target for social engineering campaigns. According to ATT&CK framework, this vulnerability aligns with technique T1203, which involves exploiting software vulnerabilities to gain execution privileges, and T1059, which covers command and scripting interpreter usage for exploitation.
Mitigation strategies for CVE-2017-17787 should prioritize immediate software updates to versions that have patched the buffer over-read condition. Users should disable or remove the problematic PSP plugin if immediate updates are not possible, as this prevents the vulnerable code path from being executed. Additionally, implementing strict file validation procedures and sandboxing mechanisms can help reduce the attack surface. Security-conscious administrators should consider deploying network-based intrusion detection systems to monitor for exploitation attempts targeting this specific vulnerability. The patching process should include thorough regression testing to ensure that the fix does not introduce new issues while addressing the underlying buffer over-read condition. Organizations should also consider implementing application whitelisting policies that restrict execution of untrusted image files, particularly those from unknown sources, to reduce the risk of exploitation.