Symlink Attack Vulnerability in NetBSD Mail System
CVE-2016-6253

7.8HIGH

Key Information:

Vendor

Netbsd

Status
Netbsd
Vendor
CVE Published:
20 January 2017

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2016-6253?

The mail.local component in specific versions of NetBSD is vulnerable to a symlink attack, allowing local users to change file ownership or append data to arbitrary files. This vulnerability arises from insufficient validation of user mailbox locations, leading to the potential unauthorized access and manipulation of critical files on the system. Exploiting this weakness may enable a local attacker to escalate their privileges and disrupt system integrity.

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2016-6253 - Proof of Concept

CVE-2016-6253 - Proof of Concept

CVE-2016-6253 - Proof of Concept

References

http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetB...
vendor-advisoryx_refsource_NETBSD
http://packetstormsecurity.com/files/138021/NetBSD-mail.l...
x_refsource_MISC
https://www.exploit-db.com/exploits/40141/
exploitx_refsource_EXPLOIT-DB

EPSS Score

7% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.