Vulnerability · Published Jun 2, 2020 · Assigned by snyk
CVE-2020-7663
High 7.5
In plain English
A high-severity security flaw in websocket-extensions (ruby). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 4.6% (higher than 92% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
websocket-extensions ruby module prior to 0.1.5 allows Denial of Service (DoS) via Regex Backtracking. The extension parser may take quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. This could be abused by an attacker to conduct Regex Denial Of Service (ReDoS) on a single-threaded server by providing a malicious payload with the Sec-WebSocket-Extensions header.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | ruby-websocket-extensions | 0.1.5-1 | DEBIAN-CVE-2020-7663 |
| Debian:13 | ruby-websocket-extensions | 0.1.5-1 | DEBIAN-CVE-2020-7663 |
| Debian:14 | ruby-websocket-extensions | 0.1.5-1 | DEBIAN-CVE-2020-7663 |
| RubyGems | websocket-extensions | 0.1.5 | GHSA-g6wq-qcwm-j5g2 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| n/a | websocket-extensions (ruby) | All versions prior to 0.1.5 |
References
- https://github.com/faye/websocket-extensions-ruby/security/advisories/GHSA-g6wq-qcwm-j5g2 x_refsource_MISC
- https://github.com/faye/websocket-extensions-ruby/commit/aa156a439da681361ed6f53f1a8131892418838b x_refsource_MISC
- https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions x_refsource_MISC
- https://snyk.io/vuln/SNYK-RUBY-WEBSOCKETEXTENSIONS-570830 x_refsource_MISC
- [debian-lts-announce] 20200819 [SECURITY] [DLA 2334-1] ruby-websocket-extensions security update mailing-list, x_refsource_MLIST
- USN-4502-1 vendor-advisory, x_refsource_UBUNTU