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GHSA-6fgx-x7m2-74qm
No affected components available
Impact
For tracexec's command line reconstruction feature, when a traced process executes another process with a environment variable where the key starts with a dash, tracexec incorrectly shows its commandline where such environment variables could cause argument injection for the env command.
Such an injection is completely at the UI level unless the user tries to copy the command line with the injection and paste it into a terminal to execute it.
A minimal POC is executing env -- -a=b bash --norc in tracexec's TUI mode. The resulting command line of env executing bash would be env -a bash -a=b _=/usr/bin/env /usr/bin/bash --norc in tracexec's TUI, which injects -a=b into env's arguments.
This has very limited effect for security. A local adversarial could leverage this to make tracexec show an inaccurate reconstructed commandline for their executed command. If the user of tracexec decides to copy and run the reconstructed commandline,
there could be injection for env's --block-signal, --default-signal, --ignore-signal, --split-string, --unset, --chdir, --argv0 arguments.
Patches
The fix is https://github.com/kxxt/tracexec/pull/118. Users are advised to upgrade to 0.14.0.
Workarounds
Don't blindly paste and execute commands copied from tracexec that contains environment variable where the key starts with a dash.
The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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