Ubuntu update for curl
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2023-27533 CVE-2023-27535 CVE-2023-27536 |
| CWE-ID | CWE-20 CWE-371 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
Ubuntu Operating systems & Components / Operating system curl (Ubuntu package) Operating systems & Components / Operating system package or component libcurl3 (Ubuntu package) Operating systems & Components / Operating system package or component libcurl3-nss (Ubuntu package) Operating systems & Components / Operating system package or component libcurl3-gnutls (Ubuntu package) Operating systems & Components / Operating system package or component |
| Vendor | Canonical Ltd. |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Input validation error
EUVDB-ID: #VU73826
Risk: Low
CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2023-27533
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to manipulate requests.
The vulnerability exists due to missing documentation of the TELNET protocol support and the ability to pass on user name and "telnet options" for the server negotiation. A remote attacker can manipulate the connection sending unexpected data to the server via the affected client.
Update the affected package curl to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 16.04
curl (Ubuntu package): before Ubuntu Pro (Infra-only)
libcurl3 (Ubuntu package): before Ubuntu Pro (Infra-only)
libcurl3-nss (Ubuntu package): before Ubuntu Pro (Infra-only)
libcurl3-gnutls (Ubuntu package): before Ubuntu Pro (Infra-only)
CPE2.3- cpe:2.3:o:canonical:ubuntu:14.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:curl_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:o:canonical:libcurl3_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:o:canonical:libcurl3-nss_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:o:canonical:libcurl3-gnutls_ubuntu_package:*:*:*:*:*:ubuntu:*:*
https://ubuntu.com/security/notices/USN-5964-2
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) State Issues
EUVDB-ID: #VU73828
Risk: Low
CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2023-27535
CWE-ID:
CWE-371 - State Issues
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain unauthorized access to FTP server.
The vulnerability exists due to cURL will reuse a previously created FTP connection even when one or more options had been changed that could have made the effective user a very different one. A remote attacker can connect to the FTP server using credentials supplied by another user and gain access to otherwise restricted functionality.
The settings in questions are CURLOPT_FTP_ACCOUNT, CURLOPT_FTP_ALTERNATIVE_TO_USER, CURLOPT_FTP_SSL_CCC and CURLOPT_USE_SSL level.
Update the affected package curl to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 16.04
curl (Ubuntu package): before Ubuntu Pro (Infra-only)
libcurl3 (Ubuntu package): before Ubuntu Pro (Infra-only)
libcurl3-nss (Ubuntu package): before Ubuntu Pro (Infra-only)
libcurl3-gnutls (Ubuntu package): before Ubuntu Pro (Infra-only)
CPE2.3- cpe:2.3:o:canonical:curl_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:o:canonical:libcurl3_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:o:canonical:libcurl3-nss_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:o:canonical:libcurl3-gnutls_ubuntu_package:*:*:*:*:*:ubuntu:*:*
https://ubuntu.com/security/notices/USN-5964-2
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) State Issues
EUVDB-ID: #VU73829
Risk: Medium
CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2023-27536
CWE-ID:
CWE-371 - State Issues
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to cURL will reuse a previously created connection even when the GSS delegation (CURLOPT_GSSAPI_DELEGATION) option had been changed that could have changed the user's permissions in a second transfer. libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. However, this GSS delegation setting was left out from the configuration match checks, making them match too easily, affecting krb5/kerberos/negotiate/GSSAPI transfers.
MitigationUpdate the affected package curl to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 16.04
curl (Ubuntu package): before Ubuntu Pro (Infra-only)
libcurl3 (Ubuntu package): before Ubuntu Pro (Infra-only)
libcurl3-nss (Ubuntu package): before Ubuntu Pro (Infra-only)
libcurl3-gnutls (Ubuntu package): before Ubuntu Pro (Infra-only)
CPE2.3- cpe:2.3:o:canonical:curl_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:o:canonical:libcurl3_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:o:canonical:libcurl3-nss_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:o:canonical:libcurl3-gnutls_ubuntu_package:*:*:*:*:*:ubuntu:*:*
https://ubuntu.com/security/notices/USN-5964-2
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
