alt Hacker NewsThis isn't a novel technical vulnerability write up.
The author had copilot read a "prompt injection" inside a readme while copilot is enabled to execute code or run bash commands (which user had to explicitly agree to).
I highly suspect this account is astro-turfing for the site too... look at their sidebar:
``` Claude Cowork Exfiltrates Files
HN #1
Superhuman AI Exfiltrates Emails
HN #12
IBM AI ('Bob') Downloads and Executes Malware
HN #1
Notion AI: Data Exfiltration
HN #4
HuggingFace Chat Exfiltrates Data
Screen takeover attack in vLex (legal AI acquired for $1B)
Google Antigravity Exfiltrates Data
HN #1
CellShock: Claude AI is Excel-lent at Stealing Data
Hijacking Claude Code via Injected Marketplace Plugins
Data Exfiltration from Slack AI via Indirect Prompt Injection
HN #1
Data Exfiltration from Writer.com via Indirect Prompt Injection
HN #5 ```
Replies
Isn’t the news that “curl whatever” will prompt the user for confirmation but “env curl whatever” won’t?
It does circumvent a flimsy control:
"The env command is part of a hard-coded read-only command list stored in the source code. This means that when Copilot requests to run it, the command is automatically approved for execution without user approval."
Reading the other posts on their site, I don't agree. It's just like any other security research shop. I've found most of their posts quite thorough and the controls being circumvented well explained.
Please email the mods rather than posting accusations of astroturfing. You may well be right, but they specifically direct us to say that to them rather than in comments. The footer contact email works well for this.
It's probably bad that the system 1) usually prompts you to take shell actions like `curl`, but 2) by default whitelists `env` and `find` that can invoke whatever it wants without approval.
If 2) is fine then why bother with 1)? In yolo mode such an injection would be "working as designed", but it's not in yolo mode. It shouldn't be able to just do `env sh` and run whatever it wants without approval.