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* bug#66390: `man' allows to inject arbitrary shell code
@ 2023-10-07 12:47 Maxim Nikulin
  2023-10-07 13:04 ` Eli Zaretskii
  0 siblings, 1 reply; 47+ messages in thread
From: Maxim Nikulin @ 2023-10-07 12:47 UTC (permalink / raw)
  To: 66390

man.el does not escape properly shell special characters when `man' is 
invoked with an argument to open particular manual page. As a result 
arbitrary shell code may be executed.

I do not consider it as a real issue when the `man' command is invoked 
by a user directly. However it is a security vulnerability when other 
packages calls `man' to open a specific page.

Consider an Org mode document with the following link and ol-man is loaded

   <man:File:\:UserDirs(3pm)>

In response to C-c C-o (`org-open-at-point') an error appears instead of 
formatted manual page

--- 8< ---
/usr/bin/sh: 1: Syntax error: "(" unexpected

process exited abnormally with code 2
--- >8 ---

Alternatively just evaluate

  (man "File:\\:UserDirs(3pm)")

A side note: I tried to add backslash due to an issue with ol-man that 
is to be fixed. A workaround in this particular case is to remove 
"(3pm)". Though the real problem is that special characters "()" are not 
quoted.

I would not consider the issue as a severe one unless some users who 
wish to open arbitrary Org files from the net

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=58774#34
> Org files are native to Emacs, I wish to open Org files by using EWW.

man.el should prevent substitution of shell specials literally from 
`man' arguments into shell commands.





^ permalink raw reply	[flat|nested] 47+ messages in thread

end of thread, other threads:[~2024-01-11 15:37 UTC | newest]

Thread overview: 47+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-10-07 12:47 bug#66390: `man' allows to inject arbitrary shell code Maxim Nikulin
2023-10-07 13:04 ` Eli Zaretskii
2023-10-07 14:12   ` Max Nikulin
2023-10-07 14:19     ` Eli Zaretskii
2023-10-07 14:29       ` Max Nikulin
2023-10-07 15:10         ` Eli Zaretskii
2023-10-07 15:37         ` Michael Albinus
2023-10-07 15:58           ` Eli Zaretskii
2023-10-07 16:55             ` Michael Albinus
2023-10-07 17:24               ` Eli Zaretskii
2023-10-07 17:45                 ` Michael Albinus
2023-10-07 18:26                   ` Eli Zaretskii
2023-10-08  3:37                     ` Max Nikulin
2023-10-08  5:28                       ` Eli Zaretskii
2023-10-09 15:12                         ` Max Nikulin
2023-10-09 15:52                           ` Eli Zaretskii
2023-10-09 16:30                         ` lux
2023-10-09 16:48                           ` Eli Zaretskii
2023-10-09 17:07                             ` Ihor Radchenko
2023-10-09 17:20                             ` Andreas Schwab
2023-10-10  2:47                             ` lux
2023-10-10  7:43                             ` Stefan Kangas
2023-10-10 12:11                               ` Eli Zaretskii
2023-10-10 12:25                                 ` Stefan Kangas
2023-10-10 11:09                             ` Max Nikulin
2023-10-10 10:54                           ` Max Nikulin
2023-10-10 14:30                             ` lux
2023-10-10 16:21                               ` Andreas Schwab
2023-10-11  3:08                                 ` lux
2023-10-11 10:46                                   ` Max Nikulin
2023-10-20 21:00                                   ` Stefan Kangas
2023-10-21  7:19                                     ` Eli Zaretskii
2023-10-21  7:35                                       ` Andreas Schwab
2023-10-21  7:45                                         ` Eli Zaretskii
2023-10-21  9:19                                           ` Stefan Kangas
2024-01-10 21:21                                       ` Stefan Kangas
2024-01-11 12:07                                         ` Ihor Radchenko
2024-01-11 14:34                                           ` Max Nikulin
2024-01-11 15:07                                             ` Ihor Radchenko
2024-01-11 15:28                                               ` Eli Zaretskii
2024-01-11 15:37                                                 ` Ihor Radchenko
2023-10-09  2:36                     ` Richard Stallman
2023-10-09 11:04                       ` Eli Zaretskii
2023-10-10 11:56                         ` Richard Stallman
2023-10-11 10:56                           ` Max Nikulin
2023-10-08  3:42                 ` Maxim Nikulin
2023-10-08  5:20                   ` Eli Zaretskii

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