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Potential Argument Injection Issue in Cygwin's Command Line Handling
Hello Cygwin team,
I am splitline from DEVCORE research team. I recently have observed an
inconsistency
in how Cygwin handles command-line parsing compared to Microsoft’s
implementation.
According to Microsoft’s documentation [1], the \" sequence should always
be
interpreted as a literal double quote ("):
> A double quote mark preceded by a backslash (\") is interpreted as a
literal
> double quote mark (").
However, in Cygwin, the same sequence treats the backslash as a literal
character
and starts quote mode instead.
[1]
https://learn.microsoft.com/en-us/cpp/c-language/parsing-c-command-line-arguments
This inconsistency can cause unexpected behavior when passing executable
arguments
via the command line (as opposed to Cygwin’s `execve` method), potentially
leading
to argument injection vulnerabilities.
Below is my testing process using the Python from Python.org (not the
Cygwin version):
splitline@SPLITLINE0D06 ~
$ which gcc
/usr/bin/gcc
splitline@SPLITLINE0D06 ~
$ cat test.c
#include
int main(int argc, char* argv[], char* envp[]) {
for (int i = 0; i < argc; ++i)
printf("argv[%d] = %s\n", i, argv[i]);
}
splitline@SPLITLINE0D06 ~
$ gcc test.c -o test.exe
splitline@SPLITLINE0D06 ~
$ which python
/cygdrive/c/Python313/python
splitline@SPLITLINE0D06 ~
$ python
Python 3.13.1 (tags/v3.13.1:0671451, Dec 3 2024, 19:06:28) [MSC v.1942
64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import subprocess
>>> subprocess.run(['./test.exe', '"', " a b c"]) # should be only 2 args
argv[0] = ./test
argv[1] = \
argv[2] = a
argv[3] = b
argv[4] = c
CompletedProcess(args=['./test.exe', '"', ' a b c'], returncode=0)
>>>
As we can see, it should originally be only 2 arguments: ["] and [ a b c].
However,
the command line is parsed into 4 different arguments.
Note: With that Python code, the spawned command line is: ./test.exe \" " a
b c"
Please let me know if you have any questions, thanks!
Best regards,
splitline
DEVCORE
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This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address failed: angel.chave...@aol.com: SMTP error from remote server for TEXT command, host: mx-aol.mail.gm0.yahoodns.net (98.136.96.93) reason: 554 30 Sorry, your message to angel.chave...@aol.com cannot be delivered. This mailbox is disabled (554.30). --- The header of the original message is following. --- Received: from winhex19beeu13.wineu.mail ([10.72.140.17]) by mri.eue.server.lan (mrieue103 [10.74.38.52]) with ESMTPS (Nemesis) id 1N3qFS-1tEq0F1NhY-00wlhf for ; Mon, 03 Feb 2025 22:30:07 +0100 Received: from [50.114.115.99] (10.72.140.251) by winhex19beeu13.wineu.mail (10.72.140.17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.1544.13; Mon, 3 Feb 2025 22:30:06 +0100 Content-Type: multipart/mixed; boundary="===0165619975209016937==" MIME-Version: 1.0 From: =?UTF-8?Q?Job Alerts Wioa?= To: Subject: =?UTF-8?Q?Wioa Job Opportunities for You?= Date: Mon, 3 Feb 2025 21:30:05 + Message-ID: <173861820545.14888.10630567153602208...@cygwin.com> X-Accept-Language: en-us, en Return-Path: cygwin@cygwin.com X-ClientProxiedBy: winhex19beeu40.wineu.mail (10.72.140.163) To winhex19beeu13.wineu.mail (10.72.140.17) X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:0Gs+ybwe0vc=;+GhsiTdvaSbBsIYH5J+dFpSfeV8 kbuwGy7ZI4B2IBytBwUu/aAgvlbeVHsHqODvKp6+6rRS8MQ24o5e5Zm9bMALVeAM0OeHacMeT cDPITqbrvkebfIYlGPaaEKwjchDuj7EARvDdMRXBQ8YOww2iILKpbLUytfTLD2P0YV3y/99AW jjjDJGbPLUTgO53enxkWj9LLltl7aPlVokLkinbCzzDH7UzItTsgoaCqG8GNMZkMK3qoDRiHp zJ7MKu0f0cJhPIMsn3YtdEujW8M9T+zd9V38ClEr+ZER+GOP5Lr26SAz9bRIgfeZy75P9UfBS FMLdmKnRS8qC0/XGQTidFgb3nhHsb2wc4gk9H+pyy7ij39UbBI4c1OJx9YIZeFv/sMG3bW1gE JLYwKOLamEIMSWgMaAxmrvD/8EVCgWEpdJXQra3/d5VPJ1cfiGT6Swo6dTlGnbWZAlihF/M8i S4fk32Il9WHwnsIV3WigcIlXSejoqL0GgHiGrLLS/9R/guSFZz83TBlFARXrJ/Gp9cKZbTHvD rVfhROvBJcXE2SzJTiMJqvaioBdlMCYjjAizeVvcRIO2hce+H6iMqEMJsG/QX9DzBhzPFG9hF OH4muiYjmUU/DicarLOymf2jVSKDcCfzLADHj+2YAWY9o4LdsLHoUYSu52lBOTwH5nLjiDSmf BDU5b7DB5Tcw+S+6ilMF5T6UlSak5apSCtC5iieYUvS7dXOMOCWmTzkB4mIHG4Gr/WaFEVbdr S/8qZgYkGZstgFLm0FI7iszTYEdpz1uQZLCp32EZzujtSEtN+QglzHQiMeQMzMeK9GzwM+Iou 5Ziycj6Rg7+X1tehRJKad9fm5fThU2Kwo7RXpRMboFPDfy/eliPAfH3KphyHtolDfWT9Ww/M3 dTpiB6aiGSu1PAl1/G20OTZzasKUckTLAV70SQCusdTe0ekDmBSTAmHkf Reporting-MTA: dns;kundenserver.de Arrival-Date: Mon, 03 Feb 2025 22:30:07 +0100 Final-Recipient: rfc822;angel.chavez11@aol.com Action: failed Status: 5.0.0 Final-Log-ID: 1N3qFS-1tEq0F1NhY-00wlhf Received: from winhex19beeu13.wineu.mail ([10.72.140.17]) by mri.eue.server.lan (mrieue103 [10.74.38.52]) with ESMTPS (Nemesis) id 1N3qFS-1tEq0F1NhY-00wlhf for ; Mon, 03 Feb 2025 22:30:07 +0100 Received: from [50.114.115.99] (10.72.140.251) by winhex19beeu13.wineu.mail (10.72.140.17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.1544.13; Mon, 3 Feb 2025 22:30:06 +0100 Content-Type: multipart/mixed; boundary="===0165619975209016937==" MIME-Version: 1.0 From: =?UTF-8?Q?Job Alerts Wioa?= To: Subject: =?UTF-8?Q?Wioa Job Opportunities for You?= Date: Mon, 3 Feb 2025 21:30:05 + Message-ID: <173861820545.14888.10630567153602208...@cygwin.com> X-Accept-Language: en-us, en Return-Path: cygwin@cygwin.com X-ClientProxiedBy: winhex19beeu40.wineu.mail (10.72.140.163) To winhex19beeu13.wineu.mail (10.72.140.17) X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:0Gs+ybwe0vc=;+GhsiTdvaSbBsIYH5J+dFpSfeV8 kbuwGy7ZI4B2IBytBwUu/aAgvlbeVHsHqODvKp6+6rRS8MQ24o5e5Zm9bMALVeAM0OeHacMeT cDPITqbrvkebfIYlGPaaEKwjchDuj7EARvDdMRXBQ8YOww2iILKpbLUytfTLD2P0YV3y/99AW jjjDJGbPLUTgO53enxkWj9LLltl7aPlVokLkinbCzzDH7UzItTsgoaCqG8GNMZkMK3qoDRiHp zJ7MKu0f0cJhPIMsn3YtdEujW8M9T+zd9V38ClEr+ZER+GOP5Lr26SAz9bRIgfeZy75P9UfBS FMLdmKnRS8qC0/XGQTidFgb3nhHsb2wc4gk9H+pyy7ij39UbBI4c1OJx9YIZeFv/sMG3bW1gE JLYwKOLamEIMSWgMaAxmrvD/8EVCgWEpdJXQra3/d5VPJ1cfiGT6Swo6dTlGnbWZAlihF/M8i S4fk32Il9WHwnsIV3WigcIlXSejoqL0GgHiGrLLS/9R/guSFZz83TBlFARXrJ/Gp9cKZbTHvD rVfhROvBJcXE2SzJTiMJqvaioBdlMCYjjAizeVvcRIO2hce+H6iMqEMJsG/QX9DzBhzPFG9hF OH4muiYjmUU/DicarLOymf2jVSKDcCfzLADHj+2YAWY9o4LdsLHoUYSu52lBOTwH5nLjiDSmf BDU5b7DB5Tcw+S+6ilMF5T6UlSak5apSCtC5iieYUvS7dXOMOCWmTzkB4mIHG4Gr/WaFEVbdr S/8qZgYkGZstgFLm0FI7iszTYEdpz1uQZLCp32EZzujtSEtN+QglzHQiMeQMzMeK9GzwM+Iou 5Ziycj6Rg7+X1tehRJKad9fm5fThU2Kwo7RXpRMboFPDfy/eliPAfH3KphyHtolDfWT9Ww/M3 dTpiB6aiGSu1PAl1/G20OTZzasKUckTLAV70SQCusdTe0ekDmBSTAmHkf -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation:https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
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Re: Potential Argument Injection Issue in Cygwin's Command Line Handling
On 04/02/2025 07:15, Splitline Huang via Cygwin wrote:
Hello Cygwin team,
I am splitline from DEVCORE research team. I recently have observed an
inconsistency
in how Cygwin handles command-line parsing compared to Microsoft’s
implementation.
According to Microsoft’s documentation [1], the \" sequence should always
be
interpreted as a literal double quote ("):
A double quote mark preceded by a backslash (\") is interpreted as a
literal
double quote mark (").
However, in Cygwin, the same sequence treats the backslash as a literal
character
and starts quote mode instead.
$ which python
/cygdrive/c/Python313/python
splitline@SPLITLINE0D06 ~
$ python
Python 3.13.1 (tags/v3.13.1:0671451, Dec 3 2024, 19:06:28) [MSC v.1942
64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
import subprocess
subprocess.run(['./test.exe', '"', " a b c"]) # should be only 2 args
argv[0] = ./test
argv[1] = \
argv[2] = a
argv[3] = b
argv[4] = c
CompletedProcess(args=['./test.exe', '"', ' a b c'], returncode=0)
As we can see, it should originally be only 2 arguments: ["] and [ a b c].
However,
the command line is parsed into 4 different arguments.
$ python3.12
Python 3.12.8 (main, Jan 31 2025, 21:29:51) [GCC 12.4.0] on cygwin
Type "help", "copyright", "credits" or "license" for more information.
import subprocess
subprocess.run(['./test.exe', '"', " a b c"])
argv[0] = ./test
argv[1] = "
argv[2] = a b c
CompletedProcess(args=['./test.exe', '"', ' a b c'], returncode=0)
it seems correct to me for a Cygwin Python
Note: With that Python code, the spawned command line is: ./test.exe \" " a
b c"
Please let me know if you have any questions, thanks!
Best regards,
splitline
DEVCORE
Regards
Marco
PS: Windows is not very consistent on quoting behaviour, e.g.
https://github.com/Azure/azure-cli/blob/dev/doc/quoting-issues-with-powershell.md
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