Facebook Hermes BigInt Conversion out-of-bounds write

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.1$0-$5k0.00

A vulnerability classified as critical was found in Facebook Hermes (Social Network Software) (affected version unknown). This vulnerability affects an unknown functionality of the component BigInt Conversion. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

An error in BigInt conversion to Number in Hermes prior to commit a6dcafe6ded8e61658b40f5699878cd19a481f80 could have been used by a malicious attacker to execute arbitrary code due to an out-of-bound write. Note that this bug is only exploitable in cases where Hermes is used to execute untrusted JavaScript. Hence, most React Native applications are not affected.

The weakness was shared 05/19/2023. The advisory is shared for download at facebook.com. This vulnerability was named CVE-2023-23556 since 01/12/2023. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/14/2023).

Applying the patch a6dcafe6ded8e61658b40f5699878cd19a481f80 is able to eliminate this problem. The bugfix is ready for download at github.com.

Productinfo

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Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.2
VulDB Meta Temp Score: 7.1

VulDB Base Score: 4.6
VulDB Temp Score: 4.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: a6dcafe6ded8e61658b40f5699878cd19a481f80

Timelineinfo

01/12/2023 🔍
05/19/2023 +126 days 🔍
05/19/2023 +0 days 🔍
06/14/2023 +26 days 🔍

Sourcesinfo

Advisory: a6dcafe6ded8e61658b40f5699878cd19a481f80
Status: Confirmed

CVE: CVE-2023-23556 (🔍)

Entryinfo

Created: 05/19/2023 07:01 AM
Updated: 06/14/2023 07:56 AM
Changes: 05/19/2023 07:01 AM (41), 06/14/2023 07:49 AM (1), 06/14/2023 07:56 AM (11)
Complete: 🔍
Cache ID: 18:C6C:40

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