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Incorrect Authorization and Exposure of Sensitive Information to an Unauthorized Actor in scrapy

Moderate severity GitHub Reviewed Published Mar 1, 2022 in scrapy/scrapy • Updated Oct 22, 2024

Package

pip scrapy (pip)

Affected versions

< 1.8.2
>= 2.0.0, < 2.6.0

Patched versions

1.8.2
2.6.1

Description

Impact

If you manually define cookies on a Request object, and that Request object gets a redirect response, the new Request object scheduled to follow the redirect keeps those user-defined cookies, regardless of the target domain.

Patches

Upgrade to Scrapy 2.6.0, which resets cookies when creating Request objects to follow redirects¹, and drops the Cookie header if manually-defined if the redirect target URL domain name does not match the source URL domain name².

If you are using Scrapy 1.8 or a lower version, and upgrading to Scrapy 2.6.0 is not an option, you may upgrade to Scrapy 1.8.2 instead.

¹ At that point the original, user-set cookies have been processed by the cookie middleware into the global or request-specific cookiejar, with their domain restricted to the domain of the original URL, so when the cookie middleware processes the new (redirect) request it will incorporate those cookies into the new request as long as the domain of the new request matches the domain of the original request.

² This prevents cookie leaks to unintended domains even if the cookies middleware is not used.

Workarounds

If you cannot upgrade, set your cookies using a list of dictionaries instead of a single dictionary, as described in the Request documentation, and set the right domain for each cookie.

Alternatively, you can disable cookies altogether, or limit target domains to domains that you trust with all your user-set cookies.

References

For more information

If you have any questions or comments about this advisory:

References

@Gallaecio Gallaecio published to scrapy/scrapy Mar 1, 2022
Published to the GitHub Advisory Database Mar 1, 2022
Reviewed Mar 1, 2022
Last updated Oct 22, 2024

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS score

0.244%
(65th percentile)

CVE ID

CVE-2022-0577

GHSA ID

GHSA-cjvr-mfj7-j4j8

Source code

Credits

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