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PoC Code Printed for Excessive-Severity macOS Sandbox Escape Vulnerability

By Ionut Arghire on November 21, 2022

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A safety researcher has printed particulars and proof-of-concept (PoC) code for a macOS vulnerability that may very well be exploited to flee a sandbox and execute code inside Terminal.

Tracked as CVE-2022-26696 (CVSS rating of seven.8), the safety defect was recognized and reported final 12 months, with a patch obtainable because the launch of macOS Monterey 12.four in Could.

In its advisory, Apple notes that the flaw allowed a sandboxed course of to avoid sandbox restrictions, and that improved setting sanitization resolved the problem.

Profitable exploitation of the vulnerability would require for the attacker to have the ability to execute low-privileged code on the goal system.

“The particular flaw exists throughout the dealing with of XPC messages within the LaunchServices part. A crafted message can set off execution of a privileged operation,” Development Micro’s Zero Day Initiative (ZDI) explains.

An attacker capable of exploit this vulnerability might “escalate privileges and execute arbitrary code within the context of the present consumer,” ZDI says.

In response to SecuRing researcher Wojciech Reguła, who was credited for reporting CVE-2022-26696, the basis reason behind the bug is that macOS permits sandboxed purposes to launch processes that don’t inherit the primary app’s sandbox profile.

The platform additionally permits for purposes to be spawned with setting variables, and CVE-2022-26696 was recognized on this mechanism.

Regula found that, on the one hand, a particular perform was returning ‘Sure’ when a particular setting variable was set, whereas, however, some setting variables weren’t cleared when the perform returned ‘Sure’.

This, the researcher says, allowed him to “execute code throughout the Terminal.app context with none sandbox”.

On Friday, Reguła printed particulars on the code wanted to use the flaw, in addition to a video demonstration on how a weaponized Phrase doc can be utilized to flee the sandbox and execute code throughout the Terminal.

“Executing code throughout the Terminal.app context may be actually harmful as it could possibly even have some TCC permissions already granted,” the researcher factors out.

Associated: Apple Patches Distant Code Execution Flaws in iOS, macOS

Associated: Apple Patches Over 100 Vulnerabilities With Launch of macOS Ventura 13

Associated: Apple Warns of macOS Kernel Zero-Day Exploitation

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