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fix: Fix path traversal vulnerability in zip extraction (bug #232873) #331

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Merged
deepin-bot merged 1 commit into from
Dec 4, 2025
Merged

fix: Fix path traversal vulnerability in zip extraction (bug #232873) #331

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13 changes: 11 additions & 2 deletions 3rdparty/libzipplugin/libzipplugin.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -787,8 +787,8 @@ ErrorType LibzipPlugin::extractEntry(zip_t *archive, zip_int64_t index, const Ex
}

strFileName = m_common->trans2uft8(statBuffer.name, m_mapFileCode[index]); // 解压文件名（压缩包中）
//fix 232873
if(strFileName.indexOf("../") != -1) {
//fix 232873 - Remove all "../" components to prevent path traversal attacks
while(strFileName.contains("../")) {
qInfo() << "skipped ../ path component(s) in " << strFileName;
strFileName = strFileName.replace("../", "");
}
Expand Down Expand Up @@ -886,6 +886,15 @@ ErrorType LibzipPlugin::extractEntry(zip_t *archive, zip_int64_t index, const Ex
// 解压完整文件名（含路径）
QString strDestFileName = options.strTargetPath + QDir::separator() + strFileName;

// Additional security check: ensure the final path is within the target directory
QString cleanTargetPath = QDir::cleanPath(QDir(options.strTargetPath).absolutePath());
QString cleanDestPath = QDir::cleanPath(QDir(strDestFileName).absolutePath());
if (!cleanDestPath.startsWith(cleanTargetPath + QDir::separator()) &&
cleanDestPath != cleanTargetPath) {
qInfo() << "Path traversal detected! Rejected path: " << strFileName;
return ET_FileWriteError;
}

QFile file(strDestFileName);

// Store parent mtime.
Expand Down