CVE-2023-45288 (CVSS 7.5)

Description

An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request's headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Other References

http://www.openwall.com/lists/oss-security/2024/04/03/16 http://www.openwall.com/lists/oss-security/2024/04/05/4 https://go.dev/cl/576155 https://go.dev/issue/65051 https://groups.google.com/g/golang-announce/c/YgW0sx8mN3M https://lists.fedoraproject.org/archives/list/[email protected]/message/QRYFHIQ6XRKRYBI2F5UESH67BJBQXUPT/ https://pkg.go.dev/vuln/GO-2024-2687 https://security.netapp.com/advisory/ntap-20240419-0009/ http://www.openwall.com/lists/oss-security/2024/04/03/16 http://www.openwall.com/lists/oss-security/2024/04/05/4

Frequently Asked Questions

What is CVE-2023-45288? +

An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request's headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2023-45288? +

CVE-2023-45288 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2023-45288? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2023-45288

Description

CVSS v3.1 Score

References

Other References

Frequently Asked Questions

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