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invalid memory read in proxy handler

High
kazuho published GHSA-p5hj-phwj-hrvx Apr 27, 2023

Package

h2o (C)

Affected versions

all

Patched versions

commit f010336

Description

Impact

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.

Patches

PR #3229 fixes the issue. The pull request has been merged to master in commit f010336.

Workarounds

Upgrade to commit f010336 or later. At the moment, there is no tagged version with the fix incorporated.

None of the non-beta released versions (i.e., versions up to 2.2.6) is affected by this vulnerability (May 15 2023).

Acknowledgements

This issue was reported by @ElijahGlover; see #3228.

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

CVE ID

CVE-2023-30847

Weaknesses

No CWEs