VulnerabilityModified

CVE-2021-28099

In Netflix OSS Hollow, since the Files.exists(parent) is run before creating the directories, an attacker can pre-create these directories with wide permissions.

MEDIUM 4.4EPSS 0.24%

Does this matter?

Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own.

Description

In Netflix OSS Hollow, since the Files.exists(parent) is run before creating the directories, an attacker can pre-create these directories with wide permissions. Additionally, since an insecure source of randomness is used, the file names to be created can be deterministically calculated.

CVSS 3.1: 4.4 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
EPSS: 0.24% probability · 16th percentile
CISA KEV: Not listed
Weakness: CWE-330
Affected: netflix/hollow
Source: security-report@netflix.com

References

https://github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2021-001.mdThird Party Advisory
https://github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2021-001.mdThird Party Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.