CVE-2007-4352 in Xpdf
Summary
by MITRE
Array index error in the DCTStream::readProgressiveDataUnit method in xpdf/Stream.cc in Xpdf 3.02pl1, as used in poppler, teTeX, KDE, KOffice, CUPS, and other products, allows remote attackers to trigger memory corruption and execute arbitrary code via a crafted PDF file.
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Analysis
by VulDB Data Team • 03/16/2021
The vulnerability identified as CVE-2007-4352 represents a critical array index error within the DCTStream::readProgressiveDataUnit method of the Xpdf library version 3.02pl1. This flaw exists in the core PDF parsing functionality that is widely integrated across numerous software ecosystems including poppler, teTeX, KDE, KOffice, and CUPS. The vulnerability stems from inadequate bounds checking during the processing of JPEG DCT (Discrete Cosine Transform) data units within PDF files, creating a condition where maliciously crafted PDF documents can exploit memory access violations.
The technical implementation of this vulnerability involves a classic buffer overflow scenario where the DCTStream::readProgressiveDataUnit function fails to properly validate array indices before accessing memory locations. When processing progressive JPEG data within PDF files, the method assumes certain array bounds that may not hold true for malformed input. This improper validation allows attackers to manipulate the index values used for accessing internal data structures, leading to out-of-bounds memory reads or writes. The flaw specifically manifests when the PDF parser encounters specially crafted JPEG segments that cause the index calculations to exceed allocated memory boundaries, potentially resulting in heap corruption or stack manipulation.
The operational impact of this vulnerability extends across multiple attack vectors due to the widespread adoption of Xpdf libraries in document processing applications. Remote attackers can exploit this weakness by crafting malicious PDF files that, when opened by vulnerable applications, trigger the exploitable code path. The memory corruption resulting from this flaw can lead to arbitrary code execution with the privileges of the affected application, potentially allowing attackers to gain full control over systems running vulnerable software. This vulnerability particularly affects server applications and desktop environments where PDF processing is common, making it a significant threat in enterprise and user environments alike.
Mitigation strategies for CVE-2007-4352 require immediate patching of affected software versions and implementation of input validation measures. Organizations should prioritize updating to patched versions of Xpdf libraries and all software products that depend on them, including poppler, CUPS, and KDE applications. The vulnerability aligns with CWE-129, which addresses improper validation of array indices, and demonstrates characteristics consistent with ATT&CK technique T1059.007 for execution through PDF-based attacks. Additional protective measures include implementing sandboxing for PDF processing, deploying content filtering solutions, and establishing strict input validation for PDF file handling within network infrastructure. Security monitoring should focus on detecting unusual PDF processing activities and potential exploitation attempts targeting this specific memory corruption vulnerability.