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A VMSF_DELTA memory corruption was discovered in unrar before 5.5.5, as used in Sophos Anti-Virus Threat Detection Engine before 3.37.2 and other products, that can lead to arbitrary code execution. An integer overflow can be caused in DataSize+CurChannel. The result is a negative value of the "DestPos" variable, which allows the attacker to write out of bounds when setting Mem[DestPos].

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Sophos Anti-Virus Threat Detection Engine unrar 安全漏洞

Sophos Anti-Virus Threat Detection Engine是英国Sophos公司的一套适用于多种操作系统的反病毒引擎，它可实时侦测和清除病毒、间谍软件、木马和蠕虫，确保台式机和笔记本电脑的全面网络保护。unrar是其中的一个命令行文档解压程序。 Sophos Anti-Virus Threat Detection Engine 3.37.2之前的版本中unrar 5.5.5之前的版本中存在内存损坏漏洞。攻击者可利用该漏洞执行任意代码，造成越边界写入。

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