PT-2023-2342 · Curl+9 · Curl+9
Harry Sintonen
·
Published
2023-03-20
·
Updated
2026-05-18
·
CVE-2023-27533
CVSS v3.1
9.8
Critical
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
curl versions prior to 8.0
Description
A vulnerability in input validation exists in curl during communication using the TELNET protocol, which 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 could be exploited if an application allows user input, thereby enabling attackers to execute arbitrary code on the system.
Recommendations
For versions prior to 8.0, update to version 8.0 or later to resolve the issue. As a temporary workaround, consider restricting user input for TELNET protocol negotiations to minimize the risk of exploitation. Avoid using the
username and telnet options variables in the affected API endpoint until the issue is resolved. At the moment, there is no other information about additional mitigation measures.Exploit
Fix
DoS
Special Elements Injection
Found an issue in the description? Have something to add? Feel free to write us 👾
Related Identifiers
Affected Products
Alt Linux
Almalinux
Astra Linux
Ibm Aix
Linuxmint
Red Hat
Red Os
Suse
Ubuntu
Curl