Vulnerability · Published Apr 27, 2023 · Assigned by GitHub_M

CVE-2023-30847H2O vulnerable to read from uninitialized pointer in the reverse proxy handler

High 8.2

In plain English

A high-severity security flaw in h2o from h2o. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities).

Severity (CVSS 3.1)8.2High

Exploit odds (30 days)0.9%top 40.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

H2O is an HTTP server. In versions 2.3.0-beta2 and prior, when the reverse proxy handler tries to processes a certain type of invalid HTTP request, it tries to build an upstream URL by reading from uninitialized pointer. This behavior can lead to crashes or leak of information to back end HTTP servers. Pull request number 3229 fixes the issue. The pull request has been merged to the `master` branch in commit f010336. Users should upgrade to commit f010336 or later.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Ubuntu:24.04:LTS	h2o	no fix listed	UBUNTU-CVE-2023-30847

Affected products (as reported)

Vendor	Product	Versions
h2o	h2o	<= 2.3.0-beta2

Weakness: CWE-824 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

References

https://github.com/h2o/h2o/security/advisories/GHSA-p5hj-phwj-hrvx x_refsource_CONFIRM
https://github.com/h2o/h2o/pull/3229 x_refsource_MISC
https://github.com/h2o/h2o/commit/f010336bab162839df43d9e87570897466c97e33 x_refsource_MISC