Out-of-Bounds Write Vulnerability in HHVM by Facebook
CVE-2020-1917

9.8CRITICAL

Key Information:

Vendor

Facebook

Status
Hhvm
Vendor
CVE Published:
10 March 2021

What is CVE-2020-1917?

The vulnerability arises from an improper handling of string manipulation within the xbuf_format_converter employed in exif_read_data. It appends a terminating null character without using the designated append character function, leading to potential out-of-bounds writes when the buffer reaches its limits. This flaw exposes systems running affected HHVM versions to the risk of unintended memory manipulation, which may allow attackers to exploit the vulnerability further. Ensure to update to the latest version to mitigate risks.

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Affected Version(s)

HHVM 4.98.0

HHVM 4.97.0

HHVM 4.96.0

References

https://hhvm.com/blog/2021/02/25/security-update.html
x_refsource_MISC
https://github.com/facebook/hhvm/commit/08193b7f0cd391025...
x_refsource_MISC

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
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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