Loop with Unreachable Exit Condition ('Infinite Loop') in pdfio

PDFio is a simple C library for reading and writing PDF files. There is a denial of service (DOS) vulnerability in the TTF parser. Maliciously crafted TTF files can cause the program to utilize 100% of the Memory and enter an infinite loop. This can also lead to a heap-buffer-overflow vulnerability. An infinite loop occurs in the read_camp function by nGroups value. The ttf.h library is vulnerable. A value called nGroups is extracted from the file, and by changing that value, you can cause the program to utilize 100% of the Memory and enter an infinite loop. If the value of nGroups in the file is small, an infinite loop will not occur. This library, whether used as a standalone binary or as part of another application, is vulnerable to DOS attacks when parsing certain types of files. Automated systems, including web servers that use this code to convert PDF submissions into plaintext, can be DOSed if an attacker uploads a malicious TTF file. This issue has been addressed in release version 1.3.1. All users are advised to upgrade. There are no known workarounds for this vulnerability.

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

不可达退出条件的循环(无限循环)

PDFio 安全漏洞

PDFio是Michael R Sweet个人开发者的一个简单的 C 库，用于读取和写入 PDF 文件。 PDFio 1.3.0版本及之前版本存在安全漏洞，该漏洞源于TTF解析器中存在拒绝服务漏洞，允许程序使用100%的内存并进入无限循环来导致堆缓冲区溢出漏洞。

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