CVE-2023-50495

What it actually does

Triggers a segmentation fault crash in the _nc_wrap_entry component of NCurses during input processing.

Why it matters to the business

Causes terminal-based applications to become unavailable, interrupting operations that depend on text interfaces and requiring restarts or workarounds.

How an attack unfolds

An attacker provides crafted input to a vulnerable NCurses application over the network; when the library processes the input requiring user interaction, the fault in _nc_wrap_entry is triggered resulting in denial of service.

How to fix it

Upgrade NCurses to a version newer than 6.4-20230418 and rebuild dependent applications; apply any available vendor patches immediately given the extended time since disclosure.

How to confirm the fix worked

Confirm the installed NCurses version exceeds 6.4-20230418, then retest input handling paths to ensure no segmentation faults occur.

Typical attack path

1. Locate applications built against the vulnerable NCurses version
2. Craft input that reaches _nc_wrap_entry
3. Deliver the input requiring user interaction
4. Induce the segmentation fault to crash the process

How to detect it

Review system and application logs for segmentation fault entries referencing NCurses or the _nc_wrap_entry function, and correlate with unexpected process terminations.

What your security team should do

• Inventory all systems using NCurses and prioritize upgrades
• Disable or sandbox affected terminal applications until patched
• Monitor crash logs for recurring segmentation faults in NCurses components