VAR-200303-0072

Vulnerability from variot - Updated: 2025-04-03 22:25

TruBlueEnvironment for MacOS 10.2.3 and earlier allows local users to overwrite or create arbitrary files and gain root privileges by setting a certain environment variable that is used to write debugging information. There is a vulnerability in the Apple MacOS Classic emulator for MacOS X that may lead to elevation of privileges. This issue exists in TruBlueEnvironment, which is included in the emulator. The environment variable is used to define a location to output debugging information to a file. Exploitation of this issue may enable a malicious local user to gain elevated privileges by causing malicious files to be run through a facility such as cron. Overwriting critical system files may also cause a denial of service. TruBlueEnvironment is a tool included with the MacOS Classic Emulator, installed as setuid root by default. There is a problem with setting environment variables in TruBlueEnvironment. Local attackers can use this vulnerability to perform privilege escalation attacks through cron tools, or overwrite important system files to perform denial-of-service attacks. If the file exists, it will be set to zero bytes. If the file does not exist, it will be created with the umask permission of the calling process. Although the attacker cannot create a file with execution permission, the file created in this way can be read and written globally. In MacOS X, this vulnerability can be used to automatically create files through cron. By default, cron uses the periodic command for daily maintenance. This command will receive several files and pass them to the SHELL parser to run. Since these scripts are run with root user privileges running, so possibly privilege escalation by running cron and TruBluEnvironment

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