Vulnerability Description
The fb_unserialize function did not impose a depth limit for nested deserialization. That meant a maliciously constructed string could cause deserialization to recurse, leading to stack exhaustion. This issue affected HHVM prior to v4.32.3, between versions 4.33.0 and 4.56.0, 4.57.0, 4.58.0, 4.58.1, 4.59.0, 4.60.0, 4.61.0, 4.62.0.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Hhvm | < 4.32.3 |
Related Weaknesses (CWE)
References
- https://github.com/facebook/hhvm/commit/1746dfb11fc0048366f34669e74318b8278a684cPatchThird Party Advisory
- https://hhvm.com/blog/2020/06/30/security-update.htmlVendor Advisory
- https://github.com/facebook/hhvm/commit/1746dfb11fc0048366f34669e74318b8278a684cPatchThird Party Advisory
- https://hhvm.com/blog/2020/06/30/security-update.htmlVendor Advisory
FAQ
What is CVE-2020-1898?
CVE-2020-1898 is a vulnerability with a CVSS score of 7.5 (HIGH). The fb_unserialize function did not impose a depth limit for nested deserialization. That meant a maliciously constructed string could cause deserialization to recurse, leading to stack exhaustion. Th...
How severe is CVE-2020-1898?
CVE-2020-1898 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-1898?
Check the references section above for vendor advisories and patch information. Affected products include: Facebook Hhvm.