CVE-2023-3635 — GzipSource does not handle an exception that might be raised when parsing a malf

GzipSource does not handle an exception that might be raised when parsing a malformed gzip buffer. This may lead to denial of service of the Okio client when handling a crafted GZIP archive, by using the GzipSource class.

01What is this vulnerability?

GzipSource does not handle an exception that might be raised when parsing a malformed gzip buffer. This may lead to denial of service of the Okio client when handling a crafted GZIP archive, by using the GzipSource class.

02Affected products

Vendor	Product	Versions
?	?	0.5.0, 1.0.0, 2.0.0, 3.0.0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

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07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-07-12T18:34:31.609Z
• Last modified: 2024-10-23T13:32:52.994Z

09References

• research.jfrog.com — https://research.jfrog.com/vulnerabilities/okio-gzip-source-unhandled-exception-…
• github.com — https://github.com/square/okio/commit/81bce1a30af244550b0324597720e4799281da7b