GHSA-67hm-27mx-9cg7 CVE-2021-41641
Link Following in Deno
- Severity
- 8.4 / 10
- High · CVSS 3.1
- Exploit chance (EPSS)
- 0.39%
- Chance of exploitation in the next 30 days. Higher than 32.96% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-59 Improper Link Resolution Before File Access ('Link Following')
- Fix
1.16.0- Upgrade deno to this version or later
Description
Deno <=1.14.0 file sandbox does not handle symbolic links correctly. When running Deno with specific write access, the Deno.symlink method can be used to gain access to any directory.
Affected versions
crates.io
| Package | Vulnerable | Fixed in |
|---|---|---|
| deno | < 1.16.0 |
1.16.0 |
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.
deno crates.io → 1.16.0
- cargo
cargo update -p deno --precise 1.16.0
Severity breakdown
CVSS 3.1 8.4
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Weakness
CWE-59: Improper Link Resolution Before File Access ('Link Following')
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
How to prevent it
- Architecture and Design: Follow the principle of least privilege when assigning access rights to entities in a software system. Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.
References
Advisories
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-x2qc-cmh9-f4hf Deno: Denial of service via non-ASCII bytes in WebSocket response headers | Medium | Also affects deno |
| GHSA-8xpq-cjcf-3wh9 Deno: Permission Bypass via Unicode Normalization Mismatch on macOS (APFS) | High | Also affects deno |
| GHSA-968w-xfqw-vp9q Deno: BYONM module resolution allows `package.json` main path traversal to bypass `--allow-read` restrictions | Medium | Also affects deno |
| GHSA-v8fw-85r8-5m23 Deno: Node TCPWrap numeric hostname aliases bypass --deny-net resolved-IP deny checks | Medium | Also affects deno |
| GHSA-9xg4-qhm4-g43w Deno: Miller-Rabin Primality Test Allows Zero Rounds | High | Also affects deno |
| GHSA-7xh3-mhg9-jcw8 Deno: Command Injection via spawnSync & spawn on Windows | High | Also affects deno |
| GHSA-4c8g-jvcx-v4hv Deno: process.loadEnvFile() bypasses env permission checks and mutates process.env with only read access | Medium | Also affects deno |
| GHSA-83pc-3rw9-qpwj Deno: WebSocket API sandbox bypass via missing post-DNS check | Medium | Also affects deno |
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