CVE-2023-50247
H2O QUIC State Exhaustion Vulnerability
Description
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The QUIC stack (quicly), as used by H2O up to commit 43f86e5 (in version 2.3.0-beta and prior), is susceptible to a state exhaustion attack. When H2O is serving HTTP/3, a remote attacker can exploit this vulnerability to progressively increase the memory retained by the QUIC stack. This can eventually cause H2O to abort due to memory exhaustion. The vulnerability has been resolved in commit d67e81d03be12a9d53dc8271af6530f40164cd35. HTTP/1 and HTTP/2 are not affected by this vulnerability as they do not use QUIC. Administrators looking to mitigate this issue without upgrading can disable HTTP/3 support.
INFO
Published Date :
Dec. 12, 2023, 8:15 p.m.
Last Modified :
Dec. 19, 2023, 6:56 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2023-50247.
| URL | Resource |
|---|---|
| https://github.com/h2o/h2o/commit/d67e81d03be12a9d53dc8271af6530f40164cd35 | Patch |
| https://github.com/h2o/h2o/security/advisories/GHSA-2ch5-p59c-7mv6 | Patch Vendor Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2023-50247 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2023-50247 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Dec. 19, 2023
Action Type Old Value New Value Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Changed Reference Type https://github.com/h2o/h2o/commit/d67e81d03be12a9d53dc8271af6530f40164cd35 No Types Assigned https://github.com/h2o/h2o/commit/d67e81d03be12a9d53dc8271af6530f40164cd35 Patch Changed Reference Type https://github.com/h2o/h2o/security/advisories/GHSA-2ch5-p59c-7mv6 No Types Assigned https://github.com/h2o/h2o/security/advisories/GHSA-2ch5-p59c-7mv6 Patch, Vendor Advisory Added CPE Configuration OR *cpe:2.3:a:dena:h2o:*:*:*:*:*:*:*:* versions up to (including) 2.2.6 *cpe:2.3:a:dena:h2o:2.3.0:beta1:*:*:*:*:*:* *cpe:2.3:a:dena:h2o:2.3.0:beta2:*:*:*:*:*:* -
CVE Received by [email protected]
Dec. 12, 2023
Action Type Old Value New Value Added Description h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The QUIC stack (quicly), as used by H2O up to commit 43f86e5 (in version 2.3.0-beta and prior), is susceptible to a state exhaustion attack. When H2O is serving HTTP/3, a remote attacker can exploit this vulnerability to progressively increase the memory retained by the QUIC stack. This can eventually cause H2O to abort due to memory exhaustion. The vulnerability has been resolved in commit d67e81d03be12a9d53dc8271af6530f40164cd35. HTTP/1 and HTTP/2 are not affected by this vulnerability as they do not use QUIC. Administrators looking to mitigate this issue without upgrading can disable HTTP/3 support. Added Reference GitHub, Inc. https://github.com/h2o/h2o/security/advisories/GHSA-2ch5-p59c-7mv6 [No types assigned] Added Reference GitHub, Inc. https://github.com/h2o/h2o/commit/d67e81d03be12a9d53dc8271af6530f40164cd35 [No types assigned] Added CWE GitHub, Inc. CWE-770 Added CVSS V3.1 GitHub, Inc. AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2023-50247 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2023-50247
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.09 }} 0.01%
score
0.40244
percentile