漏洞信息
尽管我们使用了先进的大模型技术,但其输出仍可能包含不准确或过时的信息。神龙努力确保数据的准确性,但请您根据实际情况进行核实和判断。
Vulnerability Title
Off-by-One Error in GNU Emacs for Android
Vulnerability Description
GNU Emacs for Android contains an off-by-one error in the gvar table parser in src/sfnt.c. The shared-coordinate index boundary check in sfnt_vary_simple_glyph() and sfnt_vary_compound_glyph() uses a strict greater-than comparison instead of greater-than-or-equal, allowing a crafted TrueType variable font to bypass the check and trigger a heap-based out-of-bounds read via memcpy. An attacker can deliver a malicious font file via email, EWW (Emacs Web Wowser), or documents with custom faces, causing Emacs to load it. This exposes heap memory contents which can be later used to defeat ASLR.
This issue was fixed in commit 95ab9ef627b212d74d321c5bbb5b56a1be7b9fbe
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N
Vulnerability Type
Off-by-one错误
Vulnerability Title
GNU Emacs 数字错误漏洞
Vulnerability Description
GNU emacs是美国GNU基金会开源的一款可扩展的文本编辑环境。 GNU Emacs 30.2及之前版本存在数字错误漏洞,该漏洞源于src/sfnt.c中gvar表解析器存在差一错误,共享坐标索引边界检查使用严格大于比较而非大于等于,导致特制TrueType可变字体绕过检查并通过memcpy触发堆越界读取,攻击者可通过电子邮件、EWW或自定义字体的文档传递恶意字体文件,造成堆内存内容泄露,进而可用于绕过ASLR。
CVSS Information
N/A
Vulnerability Type
N/A