7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:N/I:P/A:N
0.005 Low
EPSS
Percentile
74.9%
This is a similar but different vulnerability to the one patched in 3.12.5 and 4.3.4.
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.
The problem has been fixed in Puma 3.12.6 and Puma 4.3.5.
If you have any questions or comments about this advisory:
lists.opensuse.org/opensuse-security-announce/2020-07/msg00034.html
lists.opensuse.org/opensuse-security-announce/2020-07/msg00038.html
github.com/puma/puma
github.com/puma/puma/blob/master/History.md#434435-and-31253126--2020-05-22
github.com/puma/puma/security/advisories/GHSA-w64w-qqph-5gxm
github.com/rubysec/ruby-advisory-db/blob/master/gems/puma/CVE-2020-11077.yml
lists.debian.org/debian-lts-announce/2020/10/msg00009.html
lists.fedoraproject.org/archives/list/[email protected]/message/SKIY5H67GJIGJL6SMFWFLUQQQR3EMVPR
nvd.nist.gov/vuln/detail/CVE-2020-11077
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:N/I:P/A:N
0.005 Low
EPSS
Percentile
74.9%