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Re: git: CVE-2018-1000021: client prints server sent ANSI escape codes to the terminal, allowing for unverified messages to potentially execute arbitrary commands

On Feb 06 2018, "Randall S. Becker" <rsbecker@xxxxxxxxxxxxx> wrote:

> What I don't know - and it's not explicitly in the CVE - is just how many
> other terminal types with similar vulnerabilities are out there, but I'm
> suspecting it's larger than one would guess - mostly, it seems like this
> particular sequence is intended to be used for writing status line output
> (line 25?) instead of sticking it in a prompt. This can be used prettifies a
> lengthy bash prompt to display the current branch and repository at the
> bottom of the screen instead of in the inline prompt, but that's the user's
> choice and not something git has to deal with. There were some green-screen
> terminals with other weird ESC sequences back in the day that could really
> get into trouble with this, including loading/executing programs in terminal
> memory via output - really. I'm sure it seemed like a good idea at the time,
> but I can see how it could have been used for evil.

Do you also want to block "+++AT"?  :-)


Andreas Schwab, schwab@xxxxxxxxxxxxxx
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