CVE-2022-0618— swift-nio-http2 安全漏洞

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A program using swift-nio-http2 is vulnerable to a denial of service attack, caused by a network peer sending a specially crafted HTTP/2 frame. This vulnerability is caused by a logical error when parsing a HTTP/2 HEADERS or HTTP/2 PUSH_PROMISE frame where the frame contains padding information without any other data. This logical error caused confusion about the size of the frame, leading to a parsing error. This parsing error immediately crashes the entire process. Sending a HEADERS frame or PUSH_PROMISE frame with HTTP/2 padding information does not require any special permission, so any HTTP/2 connection peer may send such a frame. For clients, this means any server to which they connect may launch this attack. For servers, anyone they allow to connect to them may launch such an attack. The attack is low-effort: it takes very little resources to send an appropriately crafted frame. The impact on availability is high: receiving the frame immediately crashes the server, dropping all in-flight connections and causing the service to need to restart. It is straightforward for an attacker to repeatedly send appropriately crafted frames, so attackers require very few resources to achieve a substantial denial of service. The attack does not have any confidentiality or integrity risks in and of itself: swift-nio-http2 is parsing the frame in memory-safe code, so the crash is safe. However, sudden process crashes can lead to violations of invariants in services, so it is possible that this attack can be used to trigger an error condition that has confidentiality or integrity risks. The risk can be mitigated if untrusted peers can be prevented from communicating with the service. This mitigation is not available to many services. The issue is fixed by rewriting the parsing code to correctly handle the condition. The issue was found by automated fuzzing by oss-fuzz.

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长度参数不一致性处理不恰当

swift-nio-http2 安全漏洞

swift-nio-http2是一个 SwiftPM 项目，可以非常简单地构建和测试。 swift-nio-http2 1.0.0版本到1.20之前版本存在安全漏洞，该漏洞源于应用解析HTTP/2标头或HTTP/2 PUSH_PROMISE帧时存在的逻辑错误，该帧包含填充信息，而不包含任何其他数据。这个逻辑错误导致了对帧大小的混淆，导致了解析错误。此解析错误会立即使整个应用通信崩溃。攻击者可以从网络上发送特制的HTTP/2 数据帧利用该漏洞使程序崩溃出现拒绝服务问题。

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