CVE-2019-25634 — HIGH (8.4)

Vulnerability Description

Base64 Decoder 1.1.2 contains a stack-based buffer overflow vulnerability that allows local attackers to execute arbitrary code by triggering a structured exception handler (SEH) overwrite. Attackers can craft a malicious input file that overflows a buffer, overwrites the SEH chain with a POP-POP-RET gadget address, and uses an egghunter payload to locate and execute shellcode for code execution.

CVSS Score

8.4

HIGH

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

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
4Mhz	Base64 Decoder	1.1.2

Related Weaknesses (CWE)

CWE-787

References

http://4mhz.de/b64dec.htmlProductRelease Notes
http://4mhz.de/download.php?file=b64dec-1-1-2.zipProduct
https://www.exploit-db.com/exploits/46625Exploit
https://www.vulncheck.com/advisories/base64-decoder-local-buffer-overflow-seh-egThird Party Advisory

FAQ

What is CVE-2019-25634?

CVE-2019-25634 is a vulnerability with a CVSS score of 8.4 (HIGH). Base64 Decoder 1.1.2 contains a stack-based buffer overflow vulnerability that allows local attackers to execute arbitrary code by triggering a structured exception handler (SEH) overwrite. Attackers ...

How severe is CVE-2019-25634?

CVE-2019-25634 has been rated HIGH with a CVSS base score of 8.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2019-25634?

Check the references section above for vendor advisories and patch information. Affected products include: 4Mhz Base64 Decoder.