CVE:CVE-2017-7511
CNNVD:CNNVD-201705-1346
Poppler是一个用于生成PDF的C++类库，该库是从Xpdf（PDF阅读器）继承而来。pdfunite是一个Ruby包装器。
Poppler 0.17.3版本至0.55.0版本中的pdfunite存在安全漏洞。攻击者可借助特制的文档利用该漏洞造成拒绝服务（空指针逆向引用）。
solution:Upgrade freedesktop poppler to a higher version than 0.17.3,0.17.4,0.18.0,0.18.1,0.18.2,0.18.3,0.18.4,0.19.0,0.19.1,0.19.2,0.19.3,0.19.4,0.20.0,0.20.1,0.20.2,0.20.3,0.20.4,0.20.5,0.21.0,0.21.1,0.21.2,0.21.3,0.21.4,0.22.0,0.22.1,0.22.2,0.22.3,0.22.4,0.22.5,0.23.0,0.23.1,0.23.2,0.23.3,0.23.4,0.24.0,0.24.1,0.24.2,0.24.3,0.24.4,0.24.5,0.25.0,0.25.1,0.25.2,0.25.3,0.26.0,0.26.1,0.26.2,0.26.3,0.26.4,0.26.5,0.28.0,0.28.1,0.29.0,0.30.0,0.31.0,0.32.0,0.33.0,0.34.0,0.35.0,0.36.0,0.37.0,0.38.0,0.39.0,0.40.0,0.41.0,0.42.0,0.43.0,0.44.0,0.45.0,0.46.0,0.47.0,0.48.0,0.49.0,0.50.0,0.51.0,0.52.0,0.53.0,0.54.0,0.55.0,and avoid the version 0.17.3,0.17.4,0.18.0,0.18.1,0.18.2,0.18.3,0.18.4,0.19.0,0.19.1,0.19.2,0.19.3,0.19.4,0.20.0,0.20.1,0.20.2,0.20.3,0.20.4,0.20.5,0.21.0,0.21.1,0.21.2,0.21.3,0.21.4,0.22.0,0.22.1,0.22.2,0.22.3,0.22.4,0.22.5,0.23.0,0.23.1,0.23.2,0.23.3,0.23.4,0.24.0,0.24.1,0.24.2,0.24.3,0.24.4,0.24.5,0.25.0,0.25.1,0.25.2,0.25.3,0.26.0,0.26.1,0.26.2,0.26.3,0.26.4,0.26.5,0.28.0,0.28.1,0.29.0,0.30.0,0.31.0,0.32.0,0.33.0,0.34.0,0.35.0,0.36.0,0.37.0,0.38.0,0.39.0,0.40.0,0.41.0,0.42.0,0.43.0,0.44.0,0.45.0,0.46.0,0.47.0,0.48.0,0.49.0,0.50.0,0.51.0,0.52.0,0.53.0,0.54.0,0.55.0