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CVE-2020-11077— HTTP Smuggling via Transfer-Encoding Header in Puma

Quick assessment

Affected
puma puma
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Puma是美国Evan Phoenix软件开发者的一款针对高并发应用的Web服务器。 Puma (RubyGem) 4.3.5之前版本和3.12.6之前版本中存在环境问题漏洞。攻击者可利用该漏洞实施HTTP走私攻击。

CVSS 6.8 · Medium EPSS 2.81% · P85

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-11077

Vulnerability Information
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Vulnerability Title
HTTP Smuggling via Transfer-Encoding Header in Puma
Source: CVE Program / CVE List V5
Vulnerability Description
In Puma (RubyGem) before 4.3.5 and 3.12.6, a client could smuggle a request through a proxy, causing the proxy to send a response back to another unknown client. If the proxy uses persistent connections and the client adds another request in via HTTP pipelining, the proxy may mistake it as the first request's body. Puma, however, would see it as two requests, and when processing the second request, send back a response that the proxy does not expect. If the proxy has reused the persistent connection to Puma to send another request for a different client, the second response from the first client will be sent to the second client. This is a similar but different vulnerability from CVE-2020-11076. The problem has been fixed in Puma 3.12.6 and Puma 4.3.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
Puma 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Puma是美国Evan Phoenix软件开发者的一款针对高并发应用的Web服务器。 Puma (RubyGem) 4.3.5之前版本和3.12.6之前版本中存在环境问题漏洞。攻击者可利用该漏洞实施HTTP走私攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
puma puma < 3.12.6 -

II. Public POCs for CVE-2020-11077

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III. Intelligence Information for CVE-2020-11077

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Vendor Advisories for CVE-2020-11077 (1)

Mailing List Discussions for CVE-2020-11077 (4)

Other References for CVE-2020-11077 (1)

IV. Related Vulnerabilities

Same product: puma
Same vendor: puma
Same weakness: CWE-444

V. Comments for CVE-2020-11077

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