0x00 漏洞详情
Confluence Server和Data Center产品在downloadallattachments资源中存在一个路径穿越漏洞。有权向页面和（或）博客添加附件，或创建新空间或个人空间，或者对空间具有“管理员”权限的远程***者可以利用此漏洞将文件写入任意位置，最终导致远程代码执行。
0x01 影响范围
0x02 修复建议
升级Confluence Server或Data Center版本：
6.6.13
6.13.4
6.14.3
6.15.2
执行官方缓解措施：
停止Confluence编辑<install-directory>/conf/server.xml
如果你没有为 Confluence 配置 context path，则将以下代码添加至 <Host> 元素中：<br/><Context path="/pages/downloadallattachments.action" docBase="" > <Valapp className="org.apache.catalina.valapps.RemoteAddrValapp" deny="*" /> </Context>
如果你为 Confluence 配置了 context path，比如说 /wiki，则需要将以下代码添加至 <Host> 元素中：<br/><Context path="/wiki/pages/downloadallattachments.action" docBase="" > <Valapp className="org.apache.catalina.valapps.RemoteAddrValapp" deny="*" /> </Context>
0x03 环境搭建
wget https://www.atlassian.com/software/confluence/downloads/binary/atlassian-confluence-6.13.0.zip<br/>unzip atlassian-confluence-6.13.0.zip<br/>cd atlassian-confluence-6.13.0/confluence/WEB-INF/classes<br/>
编辑confluence-init.properties
修改confluence.home
启动：
cd atlassian-confluence-6.13.0/bin
./start-confluence.sh
0x04 漏洞复现
第一步上传文件：
第二步：打包下载（触发漏洞）
第三步：访问shell
http://192.168.56.248:8090/cmd13.jsp?comment=whoami
0x05 漏洞分析
使用idea 进行远程调试
首先需要在catalina.sh 添加如下代码export JAVA_OPTS='-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8002'<br/>
在idea中配置：
此时可以进行远程调试了
`public String execute() throws Exception {
List<Attachment> latestAttachments = this.attachmentManager.getLatestVersionsOfAttachments(this.getPage());
Iterator var2 = latestAttachments.iterator();
while(var2.hasNext()) {
Attachment attachment = (Attachment)var2.next();
File tmpFile = new File(this.getTempDirectoryForZipping(), attachment.getFileName());
InputStream inputStream = this.attachmentManager.getAttachmentData(attachment);
Throwable var6 = null;
try {
OutputStream fileOutputStream = new FileOutputStream(tmpFile);
Throwable var8 = null;
try {
ByteStreams.copy(inputStream, fileOutputStream);
} catch (Throwable var31) {
var8 = var31;
throw var31;
} finally {
if (fileOutputStream != null) {
if (var8 != null) {
try {
fileOutputStream.close();
} catch (Throwable var30) {
var8.addSuppressed(var30);
}
} else {
fileOutputStream.close();
}
}
}
} catch (Throwable var33) {
var6 = var33;
throw var33;
} finally {
if (inputStream != null) {
if (var6 != null) {
try {
inputStream.close();
} catch (Throwable var29) {
var6.addSuppressed(var29);
}
} else {
inputStream.close();
}
}
}
}
File zipFile = new File(this.getConfluenceTempDirectoryPath() + File.separator + this.getZipFilename() + ".zip");
FileUtils.createZipFile(this.getTempDirectoryForZipping(), zipFile);
FileUtils.deleteDir(this.getTempDirectoryForZipping());
this.downloadPath = this.prepareDownloadPath(zipFile.getPath()) + "?contentType=application/zip";
this.gateKeeper.addKey(this.prepareDownloadPath(zipFile.getPath()), this.getAuthenticatedUser());
return "success";
}`漏洞产生在：
ByteStreams.copy(inputStream, fileOutputStream);
跟踪fileOutputStream
attachment有title参数：
attachment.getFileName() 获取的值就是title
title 值来源
<br/>InputStream inStream = this.getStreamForEncoding(this.httpServletRequest);<br/>this.fileUploadManager.storeResource(new InputStreamAttachmentResource(inStream, this.filename, this.mimeType, this.size, (String)null, this.minorEdit), (ContentEntityObject)content);<br/>if (this.withEditorPlaceholder) {<br/>this.jsonResult.put("htmlForEditor", this.dragAndDropService.getAttachmentEditorHtml(this.filename, (ContentEntityObject)content, this.isVFMSupported, this.contentType));<br/>}<br/>
对filename 没有进行任何过滤
0x06 参考链接
https://confluence.atlassian.com/doc/confluence-security-advisory-2019-04-17-968660855.html
https://twitter.com/search?q=CVE-2019-3398&src=typd
https://confluence.atlassian.com/conf59/installing-confluence-on-linux-792499834.html