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Linux Command-Line Editors Vulnerable to High-Severity Bug
A bug impacting editors Vim and Neovim could allow a trojan code to escape sandbox mitigations.
A high-severity bug impacting two popular command-line text editing applications, Vim and Neovim, allow remote attackers to execute arbitrary OS commands. Security researcher Armin Razmjou warned that exploiting the bug is as easy as tricking a target into clicking on a specially crafted text file in either editor.
Razmjou outlined his research and created a proof-of-concept (PoC) attack demonstrating how an adversary can compromise a Linux system via Vim or Neowim [sic]. He said Vim versions before 8.1.1365 and Neovim before 0.3.6 are vulnerable to arbitrary code execution.
“[Outlined is] a real-life attack approach in which a reverse shell is launched once the user opens the file. To conceal the attack, the file will be immediately rewritten when opened. Also, the PoC uses terminal escape sequences to hide the modeline when the content is printed with cat. (cat -v reveals the actual content),” wrote Razmjou in a technical analysis of his research.
[...] “However, the :source! command (with the bang [!] modifier) can be used to bypass the sandbox. It reads and executes commands from a given file as if typed manually, running them after the sandbox has been left,” according to the PoC report.
Vim and Neovim have both released patches for the bug (CVE-2019-12735) that the National Institute of Standards and Technology warns, “allows remote attackers to execute arbitrary OS commands via the :source! command in a modeline.”
“Beyond patching, it’s recommended to disable modelines in the vimrc (set nomodeline), to use the securemodelinesplugin, or to disable modelineexpr (since patch 8.1.1366, Vim-only) to disallow expressions in modelines,” the researcher said.
(Score: 0, Offtopic) by realDonaldTrump on Thursday June 13 2019, @12:04AM (1 child)
Do you know Passover? It's the celebration of, the Jews painted their doors in blood. So God would know which houses were the Jewish houses. And pass them by, or over. Skipped when He was killing so many baby boys. The Egyptian boys were dieing so painfully when God snatched away their lives. Although you have to wonder, how come God needed the blood to know which houses to skip, right?
Anyway, so many of these Hack Attacks are just like that. They only happen to the folks that cheaped out on their cyber. The folks that spent a little more money get passed right over. Why not pamper yourself a little? Buy Microsoft Cyber!!!!
(Score: 2, Insightful) by Anonymous Coward on Thursday June 13 2019, @12:18AM
Microsoft shill identified. Plonk!