CVE-2024-21631 Information

Description

Vapor is an HTTP web framework for Swift. Prior to version 4.90.0 Vapor’s vapor_urlparser_parse function uses uint16_t indexes when parsing a URI’s components which may cause integer overflows when parsing untrusted inputs. This vulnerability does not affect Vapor directly but could impact applications relying on the URI type for validating user input. The URI type is used in several places in Vapor. A developer may decide to use URI to represent a URL in their application (especially if that URL is then passed to the HTTP Client) and rely on its public properties and methods. However URI may fail to properly parse a valid (albeit abnormally long) URL due to string ranges being converted to 16-bit integers. An attacker may use this behavior to trick the application into accepting a URL to an untrusted destination. By padding the port number with zeros an attacker can cause an integer overflow to occur when the URL authority is parsed and as a result spoof the host. Version 4.90.0 contains a patch for this issue. As a workaround validate user input before parsing as a URI or if possible use Foundation’s URL and URLComponents utilities.

Reference

https://github.com/vapor/vapor/security/advisories/GHSA-r6r4-5pr8-gjcp https://github.com/vapor/vapor/commit/6db3d917b5ce5024a84eb265ef65691383305d70 Vapor is an HTTP web framework for Swift. Prior to version 4.90.0 Vapor’s vapor_urlparser_parse function uses uint16_t indexes when parsing a URI’s components which may cause integer overflows when parsing untrusted inputs. This vulnerability does not affect Vapor directly but could impact applications relying on the URI type for validating user input. The URI type is used in several places in Vapor. A developer may decide to use URI to represent a URL in their application (especially if that URL is then passed to the HTTP Client) and rely on its public properties and methods. However URI may fail to properly parse a valid (albeit abnormally long) URL due to string ranges being converted to 16-bit integers. An attacker may use this behavior to trick the application into accepting a URL to an untrusted destination. By padding the port number with zeros an attacker can cause an integer overflow to occur when the URL authority is parsed and as a result spoof the host. Version 4.90.0 contains a patch for this issue. As a workaround validate user input before parsing as a URI or if possible use Foundation’s URL and URLComponents utilities.