HTTP/2 中的多个拒绝服务 (DoS) 漏洞被公开 (CVE-2019-9511, CVE-2019-9518)
A variety of Denial of Service vulnerabilities were found in third-party implementations of HTTP/2.
背景
On August 13, researchers at Netflix published an advisory for their GitHub page detailing their discovery of eight vulnerabilities in the HTTP/2 protocol implementations by third parties. The vulnerabilities were primarily discovered by Jonathan Looney, Engineering Manager at Netflix, with one vulnerability, CVE-2019-9518, discovered by Piotr Sikora, Senior Software Engineer at Google.
Image Credit: Cloudflare
分析
A client (“the attacker”) can exploit these HTTP/2 vulnerabilities by sending specially crafted requests to vulnerable servers. While these requests will vary, a vulnerable server will attempt to process the request and attempt to send a response. However, the malicious client ignores the response, leading to excess consumption of resources, which would result in a denial of service (DoS).
The following are the eight vulnerabilities and the associated nicknames given to them in the Netflix advisory.
| CVE ID | Nickname |
|---|---|
| CVE-2019-9511 | “Data Dribble” |
| CVE-2019-9512 | “Ping Flood” |
| CVE-2019-9513 | “Resource Loop” |
| CVE-2019-9514 | “Reset Flood” |
| CVE-2019-9515 | “Settings Flood” |
| CVE-2019-9516 | “0-Length Headers Leak” |
| CVE-2019-9517 | “Internal Data Buffering” |
| CVE-2019-9518 | “Empty Frames Flood” |
概念验证
At the time the blog was published, no proof-of-concept code was available.
解决方案
To immediately address the vulnerabilities, Netflix’s advisory suggests disabling HTTP/2 support, but cautions that this could either result in performance degradation or not be feasible. Software vendors are in the process of publishing patches for these vulnerabilities. Initial reports from vendors can be found below:
| Vendor | Link(s) | Source |
|---|---|---|
| Akamai | HTTP2 Vulnerabilities | 博客 |
| Ambassador (API Gateway) | Multiple HTTP/2 vulnerabilities in Envoy Proxy | 博客 |
| Apache Traffic Server (ATS) | [ANNOUNCE] Apache Traffic Server is vulnerable to various HTTP/2 attacks | Mailing List |
| Cloudflare | On the recent HTTP/2 DoS attacks | 博客 |
| Envoy (Proxy) | Version 1.11.1 History | Changelog |
| Google (Golang) | [security] Go 1.12.8 and Go 1.11.13 are released | Forum Posting |
| Microsoft | CVE-2019-9511, CVE-2019-9512, CVE-2019-9513, CVE-2019-9514, CVE-2019-9518 | Advisory |
| Netty Project | Netty 4.1.39.Final released | 博客 |
| nghttp2 | nghttp2 v1.39.2 Release Notes | Software Release |
| Nginx | NGINX Updates Mitigate the August 2019 HTTP/2 Vulnerabilities | 博客 |
| Node.js | August 2019 Security Releases | 博客 |
| Swift | About the security content of SwiftNIO HTTP/2 1.5.0 | Advisory |
Customers using these software applications are encouraged to update to the patched versions as soon as possible.
识别受影响的系统
用于识别这些漏洞的 Tenable 插件列表在发布时将显示在此处。
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Satnam Narang
安全响应高级员工研究工程师
Satnam 于 2018 年入职 Tenable。他有 15 年以上的行业经验（M86 Security 和 Symantec）。 他为反网络钓鱼工作组做出了贡献，助力国家网络安全联盟开发了一个社交网络指南，在 Twitter 上发现了一个巨大的垃圾邮件僵尸网络，并且是在 Tinder 上报告垃圾邮件僵尸网络第一人。 他还参加过 NBC Nightly News、Entertainment Tonight、Bloomberg West 和 Why Oh Why 的节目。
工作外兴趣：Satnam 写写诗，创作嘻哈音乐。他喜欢观看实况音乐，花时间教育三个侄女，享受足球和篮球带来的快乐，观看和收听宝莱坞电影和音乐以及 Grogu (Baby Yoda)。
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