GHSA-gj77-59wh-66hg CVE-2021-32723
Regular Expression Denial of Service (ReDoS) in Prism
- Severity
- 7.4 / 10
- Medium · CVSS 3.1
- Exploit chance (EPSS)
- 1.42%
- Chance of exploitation in the next 30 days. Higher than 72.85% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-400 Uncontrolled Resource Consumption
- Fix
1.24.0- Upgrade prismjs to this version or later
Description
Some languages before 1.24.0 are vulnerable to Regular Expression Denial of Service (ReDoS).
Impact
When Prism is used to highlight untrusted (user-given) text, an attacker can craft a string that will take a very very long time to highlight. Do not use the following languages to highlight untrusted text.
- ASCIIDoc
- ERB
Other languages are not affected and can be used to highlight untrusted text.
Patches
This problem has been fixed in Prism v1.24.
References
- PrismJS/prism#2774
- PrismJS/prism#2688
Affected versions
npm
| Package | Vulnerable | Fixed in |
|---|---|---|
| prismjs | < 1.24.0 |
1.24.0 |
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.
prismjs npm → 1.24.0
- npm
npm install prismjs@1.24.0- yarn
yarn add prismjs@1.24.0- pnpm
pnpm add prismjs@1.24.0
Severity breakdown
CVSS 3.1 7.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Weakness
CWE-400: Uncontrolled Resource Consumption
The product does not properly control the allocation and maintenance of a limited resource.
How to prevent it
- Architecture and Design: Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended. A strong authentication and access control model will help prevent such attacks from occurring in the first place. The login application should be protected against DoS attacks as much as possible. Limiting the database access, perhaps by caching result sets, can help minimize the resources expended. To further limit the potential for a DoS attack, consider tracking the rate of requests received from users and blocking requests that exceed a defined rate threshold.
- Architecture and Design: Mitigation of resource exhaustion attacks requires that the target system either: recognizes the attack and denies that user further access for a given amount of time, or uniformly throttles all requests in order to make it more difficult to consume resources more quickly than they can again be freed. The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question. The second solution is simply difficult to effectively institute -- and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.
- Architecture and Design: Ensure that protocols have specific limits of scale placed on them.
- Implementation: Ensure that all failures in resource allocation place the system into a safe posture.
References
Advisories
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-x7hr-w5r2-h6wg PrismJS DOM Clobbering vulnerability | Medium | Also affects prismjs |
| GHSA-3949-f494-cm99 Cross-site Scripting in Prism | Medium | Also affects prismjs |
| GHSA-hqhp-5p83-hx96 prismjs Regular Expression Denial of Service vulnerability | Medium | Also affects prismjs |
| GHSA-h4hr-7fg3-h35w Denial of service in prismjs | High | Also affects prismjs |
| GHSA-wvhm-4hhf-97x9 Cross-Site Scripting in Prism | High | Also affects prismjs |
| GHSA-cggf-277g-3q54 pypdf has possible large memory usage when parsing page tree | High | Same weakness, CWE-400 |
| GHSA-3g3m-2fjr-6pw4 Glob: AbortSignal cancellation bypass allows post-timeout filesystem traversal | Medium | Same weakness, CWE-400 |
| GHSA-42gh-23hr-vphw pypdf has possible long runtimes when retrieving page labels | High | Same weakness, CWE-400 |
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