GHSA-r6ch-mqf9-qc9w CVE-2023-24807
Regular Expression Denial of Service in Headers
- Severity
- 7.5 / 10
- High · CVSS 3.1
- Exploit chance (EPSS)
- 1.31%
- Chance of exploitation in the next 30 days. Higher than 70.75% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-1333 Inefficient Regular Expression Complexity
- Fix
5.19.1- Upgrade undici to this version or later
Description
Impact
The Headers.set() and Headers.append() methods are vulnerable to Regular Expression Denial of Service (ReDoS) attacks when untrusted values are passed into the functions. This is due to the inefficient regular expression used to normalize the values in the headerValueNormalize() utility function.
Patches
This vulnerability was patched in v5.19.1.
Workarounds
There is no workaround. Please update to an unaffected version.
References
Credits
Carter Snook reported this vulnerability.
Affected versions
npm
| Package | Vulnerable | Fixed in |
|---|---|---|
| undici | < 5.19.1 |
5.19.1 |
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.
undici npm → 5.19.1
- npm
npm install undici@5.19.1- yarn
yarn add undici@5.19.1- pnpm
pnpm add undici@5.19.1
Severity breakdown
CVSS 3.1 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Weakness
CWE-1333: Inefficient Regular Expression Complexity
The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.
How to prevent it
- Architecture and Design: Use regular expressions that do not support backtracking, e.g. by removing nested quantifiers.
- System Configuration: Set backtracking limits in the configuration of the regular expression implementation, such as PHP's pcre.backtrack_limit. Also consider limits on execution time for the process.
- Implementation: Do not use regular expressions with untrusted input. If regular expressions must be used, avoid using backtracking in the expression.
- Implementation: Limit the length of the input that the regular expression will process.
References
Advisories
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-55wc-3pg8-jfw6 undici vulnerable to Denial of Service via unhandled exception in the decompress interceptor | High | Also affects undici |
| GHSA-qrxm-fqhp-jwvm undici vulnerable to Denial of Service via TLS 1.2 certificate-changing renegotiation | High | Also affects undici |
| GHSA-9fm3-97px-rjf6 undici WebSocket client vulnerable to Denial of Service via unbounded automatic PONG buffering | High | Also affects undici |
| GHSA-4qv8-2p9j-2685 undici vulnerable to Denial of Service via unbounded memory in the EventSource parser | High | Also affects undici |
| GHSA-xjj6-f33q-929c undici vulnerable to Denial of Service via unhandled error on excessive content-encodings | High | Also affects undici |
| GHSA-f72v-6w45-q472 undici vulnerable to Subresource Integrity bypass via non-lowercase algorithm tokens | High | Also affects undici |
| GHSA-4w7w-5xrc-9h26 undici vulnerable to cache poisoning and cross-user disclosure via cross-origin redirects | Critical | Also affects undici |
| GHSA-2m5v-pch6-74hx undici vulnerable to TLS certificate validation bypass via dropped tls options in Agent | Critical | Also affects undici |
MergeHarbor checks every repository's dependencies against this database, ranks what matters by exploitability and reachability, routes it to the owning team and opens the fix pull request.
Check your repos with MergeHarbor