Friday, April 12, 2024

8-year-old Critical Privilege Escalation Vulnerability Found in the Latest Linux Kernel Version

The 8-year-old privilege escalation vulnerability allows a local user with access to the vulnerable privileged driver can escalate the privileges to read from and write to sensitive kernel memory.

It is actually an eight-year-old vulnerability and can be used in latest kernel version (4.16-rc3) for escalating privileges.

According to checkpoint researchers, the vulnerability(CVE-2018-8781) resides in the is in the internal mmap() defined in the fb_helper file operations of the “udl” driver of “DisplayLink”.

The prototype of the mmap() function from user-space there is plenty of fields an attacker can use to trigger integer overflow vulnerability.

Also Read Linux Exploit Suggester – A Kali Linux Tool to Find the Linux OS Kernel Exploits

The Vulnerability(CVE-2018-8781) receives the cvss score 7.8 and declared as critical. It affects the function udl_fb_mmap of the file drivers/gpu/drm/udl/udl_fb.c of the component udldrmfb Driver to obtain full read and write permissions on kernel physical pages, resulting in a code execution in kernel space. It impacts from Linux kernel version 3.4 up to 4.15.

How the8-year-old privilege escalation vulnerability spotted

To check the vulnerability researchers used an Ubuntu 64-bit virtual machine and uploaded a simulated vulnerable driver. With their, each tests driver’s mmap() handler contained the implementation to check.

The user-mode code performed 2 consecutive calls to mmap() on the vulnerable driver:

length = 0x1000, offset = 0x0 -> sanity check
length = 0x1000, offset = 0xFFFFFFFFFFFFFFFF – 0x1000 + 1 -> vulnerability check

When setting the buffer’s address at the page-aligned physical address of the kernel’s /dev/urandom implementation, the output (in both cases) was the expected result:

The correct physical page: 0x1531000
The previous physical page: 0x1530000

While the vulnerability was found employing a straightforward search, it absolutely was introduced to the kernel eight years agone. This reality will teach us that even on a preferred open supply project because the UNIX operating system Kernel, you may invariably hope to seek out vulnerabilities concluded checkpoint researchers.

Website

Latest articles

6-year-old Lighttpd Flaw Impacts Intel And Lenovo Servers

The software supply chain is filled with various challenges, such as untracked security vulnerabilities...

Hackers Employ Deepfake Technology To Impersonate as LastPass CEO

A LastPass employee recently became the target of an attempted fraud involving sophisticated audio...

Sisence Data Breach, CISA Urges To Reset Login Credentials

In response to a recent data breach at Sisense, a provider of data analytics...

DuckDuckGo Launches Privacy Pro: 3-in-1 service With VPN

DuckDuckGo has launched Privacy Pro, a new subscription service that promises to enhance user...

Cyber Attack Surge by 28%:Education Sector at High Risk

In Q1 2024, Check Point Research (CPR) witnessed a notable increase in the average...

Midnight Blizzard’s Microsoft Corporate Email Hack Threatens Federal Agencies: CISA Warns

The Cybersecurity and Infrastructure Security Agency (CISA) has issued an emergency directive concerning a...

Taxi App Vendor Data Leak: 300K Passengers Data Exposed

Around 300,000 taxi passengers' personal information was left exposed on the internet, causing concern...
Guru baran
Guru baranhttps://gbhackers.com
Gurubaran is a co-founder of Cyber Security News and GBHackers On Security. He has 10+ years of experience as a Security Consultant, Editor, and Analyst in cybersecurity, technology, and communications.

Top 3 SME Attack Vectors

Securing the Top 3 SME Attack Vectors

Cybercriminals are laying siege to small-to-medium enterprises (SMEs) across sectors. 73% of SMEs know they were breached in 2023. The real rate could be closer to 100%.

  • Stolen credentials
  • Phishing
  • Exploitation of vulnerabilities

Related Articles