Arbitrary Memory Access Vulnerability in HHVM by Facebook
CVE-2020-1899

7.5HIGH

Key Information:

Vendor

Facebook

Status
Hhvm
Vendor
CVE Published:
11 March 2021

What is CVE-2020-1899?

The vulnerability occurs due to the unserialize() function improperly supporting a type code, 'S', that is intended solely for APC serialization. This flaw enables arbitrary memory addresses to be accessed under the guise of static StringData objects, potentially compromising the security of applications running on HHVM. Affected versions include those prior to 4.32.3 and specific versions between 4.33.0 and 4.62.0. Developers using HHVM should review updates and apply necessary patches to mitigate risks.

Affected Version(s)

HHVM 4.62.0

HHVM 4.61.0

HHVM 4.60.0

References

https://hhvm.com/blog/2020/06/30/security-update.html
x_refsource_CONFIRM
https://github.com/facebook/hhvm/commit/1107228a5128d3ca1...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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