Access-control bypass via zero-prefixed IPv4 octets
Published Mar 31, 2021 · Updated Aug 3, 2024
Improper IP address validation in Data::Validate::IP 0.29 and earlier allows attackers to bypass IP-based access controls. The private, public, and related IP validators return false for IPv4 strings with zero-prefixed octets, while downstream OS parsing can interpret those octets as octal values. Exploitation requires an application to treat that false result as authorization and then use the same attacker-controlled address in a network operation.
Summary
What happened
Improper IP address validation in Data::Validate::IP 0.29 and earlier allows attackers to bypass IP-based access controls. The private, public, and related IP validators return false for IPv4 strings with zero-prefixed octets, while downstream OS parsing can interpret those octets as octal values. Exploitation requires an application to treat that false result as authorization and then use the same attacker-controlled address in a network operation.
The record
- CVE
- CVE-2021-29662
- Published
- Mar 31, 2021
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-704
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 31, 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
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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
- Data::Validate::IP zero-prefixed IPv4 proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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