Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Vulnerabilities / Threats

8/18/2015
05:15 PM
Connect Directly
Twitter
RSS
E-Mail
50%
50%

Unpatched 'Tpwn' Mac OS X Bug Could Grant Root Privileges

Researchers beginning to find more cracks in Mac operating systems.

Just days after Apple patched a local privilege escalation vulnerability in OS X that would grant attackers root access, they are working to patch another one.

Sunday, Italian researcher Luca Todesco published proof-of-concept code to GitHub for "Tpwn," a memory corruption bug in the kernel of OS X versions 10.9.5 (Mavericks) through 10.10.5 (Yosemite). It does not affect the forthcoming version, OS X El Capitan, which is now in beta.

As Todesco explained to MacWorld, "The memory corruption condition can then be used to circumvent kernel address space layout randomization (kASLR), a defensive technique designed to thwart exploit code from running. The attacker then gains a root shell."

Todesco created a kernel extension called NULLGuard to protect against tpwn, but later recommended users instead install SUIDGuard, a TrustedBSD kernel extension created by Mac security researcher Stefan Esser.

Todesco published the code for Tpwn just hours after he disclosed the vulnerability to Apple, for which he has received some public criticism.   

Tpwn arrives just six days after Apple patched the DYLD_PRINT_TO_FILE vulnerability in OS X Yosemite discovered last month -- a bug in an environment variable that also enabled root access.

Other cracks were found in Mac OS X recently by Synack director of research Patrick Wardle. At Black Hat Las Vegas this month, Wardle revealed exploits he'd written that circumvents Gatekeeper, OS X's mechanism for preventing unsigned code from running. 

Sara Peters is Senior Editor at Dark Reading and formerly the editor-in-chief of Enterprise Efficiency. Prior that she was senior editor for the Computer Security Institute, writing and speaking about virtualization, identity management, cybersecurity law, and a myriad ... View Full Bio
 

Recommended Reading:

Comment  | 
Print  | 
More Insights
Comments
Threaded  |  Newest First  |  Oldest First
RyanSepe
50%
50%
RyanSepe,
User Rank: Ninja
8/19/2015 | 12:36:11 PM
Mac Security
Yes, this is interesting how it ties into what Patrick was saying in his interview with Dark Reading about remote code execution. Are we going to see a surge of mac oriented security initatives now? I dont think so because of the environment size but it seems to be getting much publicity of late.
Edge-DRsplash-10-edge-articles
7 Old IT Things Every New InfoSec Pro Should Know
Joan Goodchild, Staff Editor,  4/20/2021
News
Cloud-Native Businesses Struggle With Security
Robert Lemos, Contributing Writer,  5/6/2021
Commentary
Defending Against Web Scraping Attacks
Rob Simon, Principal Security Consultant at TrustedSec,  5/7/2021
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
2021 Top Enterprise IT Trends
We've identified the key trends that are poised to impact the IT landscape in 2021. Find out why they're important and how they will affect you today!
Flash Poll
How Enterprises are Developing Secure Applications
How Enterprises are Developing Secure Applications
Recent breaches of third-party apps are driving many organizations to think harder about the security of their off-the-shelf software as they continue to move left in secure software development practices.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2020-16632
PUBLISHED: 2021-05-15
A XSS Vulnerability in /uploads/dede/action_search.php in DedeCMS V5.7 SP2 allows an authenticated user to execute remote arbitrary code via the keyword parameter.
CVE-2021-32073
PUBLISHED: 2021-05-15
DedeCMS V5.7 SP2 contains a CSRF vulnerability that allows a remote attacker to send a malicious request to to the web manager allowing remote code execution.
CVE-2021-33033
PUBLISHED: 2021-05-14
The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value.
CVE-2021-33034
PUBLISHED: 2021-05-14
In the Linux kernel before 5.12.4, net/bluetooth/hci_event.c has a use-after-free when destroying an hci_chan, aka CID-5c4c8c954409. This leads to writing an arbitrary value.
CVE-2019-25044
PUBLISHED: 2021-05-14
The block subsystem in the Linux kernel before 5.2 has a use-after-free that can lead to arbitrary code execution in the kernel context and privilege escalation, aka CID-c3e2219216c9. This is related to blk_mq_free_rqs and blk_cleanup_queue.