Buffer Overflow in Ruby's CGI Module Affecting Multiple Versions
CVE-2021-41816

9.8CRITICAL

Key Information:

Vendor

Ruby-lang

Status
Cgi
Vendor
CVE Published:
6 February 2022

What is CVE-2021-41816?

The CGI.escape_html function in Ruby versions prior to 2.7.5 and 3.x versions before 3.0.3 is susceptible to an integer overflow that can lead to a buffer overflow when processing long strings. This vulnerability also impacts the CGI gem prior to version 0.3.1. The issue arises on platforms where size_t and long types vary in size, such as Windows. Exploiting this vulnerability could allow an attacker to run arbitrary code or cause a denial of service.

References

https://hackerone.com/reports/1328463
https://www.ruby-lang.org/en/news/2021/11/24/buffer-overr...
https://security-tracker.debian.org/tracker/CVE-2021-41816

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.