CVE-2023-39326

A malicious HTTP sender can use chunk extensions to cause a receiver reading from a request or response body to read many more bytes from the network than are in the body. A malicious HTTP client can further exploit this to cause a server to automatically read a large amount of data (up to about 1GiB) when a handler fails to read the entire body of a request. Chunk extensions are a little-used HTTP feature which permit including additional metadata in a request or response body sent using the chunked encoding. The net/http chunked encoding reader discards this metadata. A sender can exploit this by inserting a large metadata segment with each byte transferred. The chunk reader now produces an error if the ratio of real body to encoded bytes grows too small.

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References

• MITRE
• NVD
• Launchpad
• Debian

Related Ubuntu Security Notices (USN)

• USN-6574-1
• Go vulnerabilities
• 11 January 2024

Other references

• https://go.dev/issue/64433
• https://github.com/golang/go/commit/ec8c526e4be720e94b98ca509e6364f0efaf28f7 (go1.21.5)
• https://github.com/golang/go/commit/6446af942e2e2b161c4ec1b60d9703a2b55dc4dd (go1.20.12)
• https://www.cve.org/CVERecord?id=CVE-2023-39326