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zdiPiotr Bazydlo (@chudypb) of Trend Micro Zero Day InitiativeZDI-23-1639
HistoryNov 15, 2023 - 12:00 a.m.

Microsoft .NET FormatFtpCommand CRLF Injection Arbitrary File Write and Deletion Vulnerability

2023-11-1500:00:00
Piotr Bazydlo (@chudypb) of Trend Micro Zero Day Initiative
www.zerodayinitiative.com
16
microsoft .net
formatftpcommand
crlf injection
arbitrary file write
arbitrary file deletion
vulnerability
remote attackers
ftp servers
attack vectors

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

7.2 High

AI Score

Confidence

High

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

0.001 Low

EPSS

Percentile

47.7%

This vulnerability allows remote attackers to create or delete arbitrary files on FTP servers implemented using affected versions of Microsoft .NET. Interaction with the .NET framework is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The specific flaw exists within the FormatFtpCommand method. The issue results from the incorrect neutralization of CRLF sequences. An attacker can leverage this vulnerability to write or delete files in the context of the FTP server.

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

7.2 High

AI Score

Confidence

High

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

0.001 Low

EPSS

Percentile

47.7%