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@netlify/ipx vulnerable to Full Response SSRF and Stored XSS via Cache Poisoning and Improper Host Validation

Moderate severity GitHub Reviewed Published Sep 21, 2022 in netlify/netlify-ipx • Updated Jan 27, 2023

Package

npm @netlify/ipx (npm)

Affected versions

< 1.2.3

Patched versions

1.2.3

Description

Impact

By sending specially crafted headers an attacker can bypass the source image domain allowlist, causing the handler to load and return arbitrary images. Because the response is cached globally, this image will then be served to visitors without requiring those headers to be set. XSS can be achieved by requesting a malicious SVG with embedded scripts, which would then be served from the site domain. Note that this does not apply to images loaded in <img> tags, as scripts do not execute in this context. The image URL can be set in the header independently of the request URL, meaning any site images that have not previously been cached can have their cache poisoned.

Patches

This problem has been fixed in version 1.2.3

Workarounds

The problem is no longer exploitable on Netlify as the CDN now sanitizes the relevant header. Cached content can be cleared by re-deploying the site.

References

@dustincrogers dustincrogers published to netlify/netlify-ipx Sep 21, 2022
Published to the GitHub Advisory Database Sep 21, 2022
Reviewed Sep 21, 2022
Published by the National Vulnerability Database Sep 23, 2022
Last updated Jan 27, 2023

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
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
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:N/UI:R/S:C/C:L/I:L/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(22nd percentile)

Weaknesses

CVE ID

CVE-2022-39239

GHSA ID

GHSA-9jjv-524m-jm98

Source code

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