Vulnerability in Websocket-Extensions Project
CVE-2020-7663
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.
EPSS: 0.044 (90.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Websocket-extensions_project Websocket-extensions
- Canonical Ubuntu_linux — versions 16.04, 18.04, 20.04
- Debian Debian_linux — versions 9.0
- N/a Websocket-extensions (Ruby) — versions All versions prior to 0.1.5
Public proof-of-concept exploits
References
- report@snyk.io (Third Party Advisory, x_refsource_MISC)
- report@snyk.io (Patch, Third Party Advisory, x_refsource_MISC)
- report@snyk.io (Third Party Advisory, x_refsource_MISC)
- report@snyk.io (Exploit, Third Party Advisory, x_refsource_MISC)
- report@snyk.io (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- report@snyk.io (x_refsource_UBUNTU, vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-7663?
- CVE-2020-7663 is a high-severity vulnerability in Websocket-Extensions Project. CVSS score: 7.5/10. Published 2020-06-02.
- How severe is CVE-2020-7663?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2020-7663 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.