漏洞信息
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Vulnerability Title
LibVNCClient Tight Gradient decoding allows malicious server-triggered heap/stack OOB writes
Vulnerability Description
LibVNCClient is a library for easy implementation of a VNC client. In 0.9.15 and earlier, LibVNCClient's Tight encoding decoder uses fixed-size 2048-pixel scratch buffers for the Gradient filter, but it does not reject Tight rectangles whose width is larger than 2048 pixels. A malicious VNC server can send a crafted FramebufferUpdate rectangle using Tight encoding with NoZlib | ExplicitFilter and the Gradient filter. When a LibVNCClient-based client connects, the client processes the server-controlled rectangle width and writes beyond fixed-size Gradient buffers. This vulnerability is fixed with commit 5b270544b85233668b98161323297d418a8f5fd1.
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Vulnerability Type
跨界内存写
Vulnerability Title
LibVNCServer 缓冲区错误漏洞
Vulnerability Description
LibVNCServer是LibVNC开源的一款支持在程序中实现VNC(虚拟网络计算)服务器或客户端功能的跨平台C语言库。 LibVNCServer 0.9.15及之前版本存在缓冲区错误漏洞,该漏洞源于Tight编码解码器使用固定大小的2048像素暂存缓冲区用于Gradient过滤器,但未拒绝宽度大于2048像素的Tight矩形,可能导致缓冲区写入越界。
CVSS Information
N/A
Vulnerability Type
N/A