MikaelgundersenH1:1784162Nextcloud: OAuth2 "authorization_code" is valid indefinetly
3.7 Low
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
7 High
AI Score
Confidence
Low
2.6 Low
CVSS2
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:H/Au:N/C:N/I:P/A:N
0.001 Low
EPSS
Percentile
19.6%
Your OAuth2 endpoint is not at all following best practices. When the authorization_code is generated it is stored without a timeout. Now according to https://www.rfc-editor.org/rfc/rfc6749#section-4.1.2 10 minutes is recommended. As the goal is that is gets used almost directly or not at all.
Now there is a debate maybe to have on the 10 minutes. But there is kind of a big difference between 10 minutes and no timeout at all.
Impact
An attacker that obtains this code could possibly easily redeem it in the future.
Or an attacker could just keep trying codes.
Related
3.7 Low
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
7 High
AI Score
Confidence
Low
2.6 Low
CVSS2
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:H/Au:N/C:N/I:P/A:N
0.001 Low
EPSS
Percentile
19.6%