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
Newest First  |  Oldest First  |  Threaded View
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.
News
Inside the Ransomware Campaigns Targeting Exchange Servers
Kelly Sheridan, Staff Editor, Dark Reading,  4/2/2021
Commentary
Beyond MITRE ATT&CK: The Case for a New Cyber Kill Chain
Rik Turner, Principal Analyst, Infrastructure Solutions, Omdia,  3/30/2021
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-2015-20001
PUBLISHED: 2021-04-11
In the standard library in Rust before 1.2.0, BinaryHeap is not panic-safe. The binary heap is left in an inconsistent state when the comparison of generic elements inside sift_up or sift_down_range panics. This bug leads to a drop of zeroed memory as an arbitrary type, which can result in a memory ...
CVE-2020-36317
PUBLISHED: 2021-04-11
In the standard library in Rust before 1.49.0, String::retain() function has a panic safety problem. It allows creation of a non-UTF-8 Rust string when the provided closure panics. This bug could result in a memory safety violation when other string APIs assume that UTF-8 encoding is used on the sam...
CVE-2020-36318
PUBLISHED: 2021-04-11
In the standard library in Rust before 1.49.0, VecDeque::make_contiguous has a bug that pops the same element more than once under certain condition. This bug could result in a use-after-free or double free.
CVE-2021-28875
PUBLISHED: 2021-04-11
In the standard library in Rust before 1.50.0, read_to_end() does not validate the return value from Read in an unsafe context. This bug could lead to a buffer overflow.
CVE-2021-28876
PUBLISHED: 2021-04-11
In the standard library in Rust before 1.52.0, the Zip implementation has a panic safety issue. It calls __iterator_get_unchecked() more than once for the same index when the underlying iterator panics (in certain conditions). This bug could lead to a memory safety violation due to an unmet safety r...