漏洞描述

Xpdf是Foo实验室的一款开源的PDF阅读器。该产品支持解码LZW压缩格式的文件以及阅读加密的PDF文件。 pdfalto 0.2版本中的Xpdf 4.0.0版本的GfxState.cc文件的‘GfxIndexedColorSpace::mapColorToBase()’函数存在安全漏洞。攻击者可发送特制的pdf文件利用该漏洞造成拒绝服务（段错误）。

There is an invalid memory access in the function GfxIndexedColorSpace::mapColorToBase() located in GfxState.cc in Xpdf 4.0.0, as used in pdfalto 0.2. It can be triggered by (for example) sending a crafted pdf file to the pdftops binary. It allows an attacker to cause Denial of Service (Segmentation fault) or possibly have unspecified other impact.