8.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2023-27533

CVE-2023-27533: A vulnerability in input validation exists in curl <8.0 during communication using the TELNET...

A vulnerability in input validation exists in curl <8.0 during communication using the TELNET protocol may allow an attacker to pass on maliciously crafted user name and "telnet options" during server negotiation. The lack of proper input scrubbing allows an attacker to send content or perform option negotiation without the application's intent. This vulnerability could be exploited if an application allows user input, thereby enabling attackers to execute arbitrary code on the system.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2023-27533

CVE-2023-27533:

8.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

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Root Cause Analysis

The vulnerability description points to improper input validation in TELNET protocol handling, specifically concerning usernames and telnet options, allowing injection of telnet commands. The commit 538b1e79a6e7b0bb829ab4cecc828d32105d0684 directly addresses this by adding ASCII validation to telnet option arguments and usernames within the check_telnet_options function in lib/telnet.c. The commit message 'telnet: only accept option arguments in ascii\n\nTo avoid embedded telnet negotiation commands etc.' further confirms this. The function check_telnet_options is responsible for parsing these potentially malicious inputs, making it the vulnerable function prior to this patch.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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