CVE-2021-43099 — MEDIUM (4.9)

Vulnerability Description

An Archive Extraction (AKA "Zip Slip) vulnerability exists in bbs 5.3 in the UpgradeNow function in UpgradeManageAction.java, which unzips the arbitrary upladed zip file without checking filenames. The vulnerability is exploited using a specially crafted archive that holds directory traversal filenames (e.g. ../../evil.exe).

CVSS Score

4.9

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

HIGH

Availability

NONE

Affected Products

Vendor	Product	Versions
Diyhi	Bbs	5.3

Related Weaknesses (CWE)

CWE-22

References

https://github.com/diyhi/bbs/issues/51ExploitThird Party Advisory
https://github.com/diyhi/bbs/issues/51ExploitThird Party Advisory

FAQ

What is CVE-2021-43099?

CVE-2021-43099 is a vulnerability with a CVSS score of 4.9 (MEDIUM). An Archive Extraction (AKA "Zip Slip) vulnerability exists in bbs 5.3 in the UpgradeNow function in UpgradeManageAction.java, which unzips the arbitrary upladed zip file without checking filenames. Th...

How severe is CVE-2021-43099?

CVE-2021-43099 has been rated MEDIUM with a CVSS base score of 4.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2021-43099?

Check the references section above for vendor advisories and patch information. Affected products include: Diyhi Bbs.