cnvd - cnvd-2021-30869

CNVD-2021-30869

Vulnerability from cnvd - Published: 2021-04-26

Title

Apache Tapestry代码执行漏洞

Description

Apache Tapestry是美国阿帕奇（Apache）基金会的一款使用Java语言编写的Web应用程序框架。 Apache Tapestry存在安全漏洞，攻击者可利用该漏洞可以通过请求URL"http： localhost：8080 assets something services AppModule.class"下载文件"AppModule.class"，该URL包含一个HMAC密钥。

Severity

高

Patch Name

Apache Tapestry代码执行漏洞的补丁

Patch Description

Formal description

目前厂商已发布升级补丁以修复漏洞，补丁获取链接： https://lists.apache.org/thread.html/r237ff7f286bda31682c254550c1ebf92b0ec61329b32fbeb2d1c8751%40%3Cusers.tapestry.apache.org%3E

Reference

https://nvd.nist.gov/vuln/detail/CVE-2021-27850

Impacted products

Name
['Apache Tapestry 5.4.5', 'Apache Tapestry 5.5.0', 'Apache Tapestry 5.6.2', 'Apache Tapestry 5.7.0']

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JSON

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    "cve": {
      "cveNumber": "CVE-2021-27850"
    }
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  "number": "CNVD-2021-30869",
  "openTime": "2021-04-26",
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  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2021-27850",
  "serverity": "\u9ad8",
  "submitTime": "2021-04-16",
  "title": "Apache Tapestry\u4ee3\u7801\u6267\u884c\u6f0f\u6d1e"
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CVE-2021-27850 (GCVE-0-2021-27850)

Vulnerability from cvelistv5 – Published: 2021-04-15 07:40 – Updated: 2024-08-03 21:33

Summary

A critical unauthenticated remote code execution vulnerability was found all recent versions of Apache Tapestry. The affected versions include 5.4.5, 5.5.0, 5.6.2 and 5.7.0. The vulnerability I have found is a bypass of the fix for CVE-2019-0195. Recap: Before the fix of CVE-2019-0195 it was possible to download arbitrary class files from the classpath by providing a crafted asset file URL. An attacker was able to download the file `AppModule.class` by requesting the URL `http://localhost:8080/assets/something/services/AppModule.class` which contains a HMAC secret key. The fix for that bug was a blacklist filter that checks if the URL ends with `.class`, `.properties` or `.xml`. Bypass: Unfortunately, the blacklist solution can simply be bypassed by appending a `/` at the end of the URL: `http://localhost:8080/assets/something/services/AppModule.class/` The slash is stripped after the blacklist check and the file `AppModule.class` is loaded into the response. This class usually contains the HMAC secret key which is used to sign serialized Java objects. With the knowledge of that key an attacker can sign a Java gadget chain that leads to RCE (e.g. CommonsBeanUtils1 from ysoserial). Solution for this vulnerability: * For Apache Tapestry 5.4.0 to 5.6.1, upgrade to 5.6.2 or later. * For Apache Tapestry 5.7.0, upgrade to 5.7.1 or later.

Severity ?

No CVSS data available.

CWE

CWE-200 - Information Exposure
CWE-502 - Deserialization of Untrusted Data

Assigner

apache

References

URL

Tags

	https://lists.apache.org/thread.html/r237ff7f286b…	x_refsource_MISC
	http://www.openwall.com/lists/oss-security/2021/04/15/1	mailing-listx_refsource_MLIST
	https://security.netapp.com/advisory/ntap-2021052…	x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	Apache Software Foundation	Apache Tapestry	Affected: Apache Tapestry 5.5.0 Affected: Apache Tapestry 5.7.0 Affected: Apache Tapestry 5.4.5 , < Apache Tapestry 5.4.0* (custom) Affected: Apache Tapestry 5.6.2 , < Apache Tapestry 5.6.0* (custom)

Credits

Apache Tapestry would like to thank Johannes Moritz for finding and notifying this vulnerability

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CNVD-2021-30869

CVE-2021-27850 (GCVE-0-2021-27850)

Tags

Sightings

Nomenclature