GHSA-3h4r-pjv6-cph9 CVE-2019-8323
RubyGems Escape sequence injection vulnerability in api response handling
- Severity
- 7.5 / 10
- High · CVSS 3.1
- Exploit chance (EPSS)
- 3.28%
- Chance of exploitation in the next 30 days. Higher than 88.44% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
- Fix
2.7.9- Upgrade rubygems-update to this version or later
Description
An issue was discovered in RubyGems 2.6 and later through 3.0.2. Gem::GemcutterUtilities#with_response may output the API response to stdout as it is. Therefore, if the API side modifies the response, escape sequence injection may occur.
Affected versions
RubyGems
| Package | Vulnerable | Fixed in |
|---|---|---|
| rubygems-update | >= 2.6.0, < 2.7.9 |
2.7.9 |
| rubygems-update | >= 3.0.0, < 3.0.2 |
3.0.2 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
rubygems-update RubyGems → 2.7.9
- bundler
bundle update rubygems-update # Gemfile: gem "rubygems-update", ">= 2.7.9"
Severity breakdown
CVSS 3.1 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Weakness
CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.
How to prevent it
- Requirements: Programming languages and supporting technologies might be chosen which are not subject to these issues.
- Implementation: Utilize an appropriate mix of allowlist and denylist parsing to filter control-plane syntax from all input.
References
Advisories
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-228f-g3h7-3fj3 RubyGems HTTPS to HTTP redirect | Medium | Also affects rubygems-update |
| GHSA-5mgj-mvv8-46mw RubyGems does not verify SSL certificate | Medium | Also affects rubygems-update |
| GHSA-qv62-xfj6-32xm RubyGems Improper Input Validation vulnerability | Medium | Also affects rubygems-update |
| GHSA-9qvm-2vhf-q649 RubyGems Regular Expression Denial of Service | Medium | Also affects rubygems-update |
| GHSA-8qxg-mff5-j3wc RubyGems Path Traversal vulnerability | Medium | Also affects rubygems-update |
| GHSA-wp3j-rvfp-624h RubyGems vulnerable to DNS hijack attack | High | Also affects rubygems-update |
| GHSA-9j7m-rjqx-48vh RubyGems Regular Expression Denial of Service vulnerability | Medium | Also affects rubygems-update |
| GHSA-p7f2-rr42-m9xm RubyGems Improper Input Validation vulnerability | High | Also affects rubygems-update |
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