Sensitive-memory disclosure via unchecked URI lookahead
Published Jun 18, 2021 · Updated Aug 3, 2024
Out-of-bounds read in RIOT-OS 2021.01 allows remote attackers to read sensitive memory by supplying a short URI to the URI parser. In sys/uri_parser/uri_parser.c, _consume_scheme reads p[1] and p[2] while checking for :// without first verifying that those bytes lie within the caller-supplied buffer. No authentication or user interaction is required, but exposure depends on an application passing attacker-controlled URI bytes to uri_parser_process.
Summary
What happened
Out-of-bounds read in RIOT-OS 2021.01 allows remote attackers to read sensitive memory by supplying a short URI to the URI parser. In sys/uri_parser/uri_parser.c, _consume_scheme reads p[1] and p[2] while checking for :// without first verifying that those bytes lie within the caller-supplied buffer. No authentication or user interaction is required, but exposure depends on an application passing attacker-controlled URI bytes to uri_parser_process.
The record
- CVE
- CVE-2021-31662
- Published
- Jun 18, 2021
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-120
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 18, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- RIOT URI parser out-of-bounds read reproducerproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo