Ubuntu update for python-cryptography
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2023-23931 CVE-2023-49083 |
| CWE-ID | CWE-388 CWE-476 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
Ubuntu Operating systems & Components / Operating system python-cryptography (Ubuntu package) Operating systems & Components / Operating system package or component python3-cryptography (Ubuntu package) Operating systems & Components / Operating system package or component |
| Vendor | Canonical Ltd. |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Error Handling
EUVDB-ID: #VU72036
Risk: Low
CVSSv4.0: 1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2023-23931
CWE-ID:
CWE-388 - Error Handling
Exploit availability: No
DescriptionThe vulnerability allows an attacker to misuse Python API.
The vulnerability exists due to a soundness bug within the Cipher.update_into function, which can allow immutable objects (such as bytes) to be mutated. A malicious programmer can misuse Python API to introduce unexpected behavior into the application.
Update the affected package python-cryptography to the latest version.
Vulnerable software versionsUbuntu: 20.04 - 23.10
python-cryptography (Ubuntu package): before 2.8-3ubuntu0.2
python3-cryptography (Ubuntu package): before 2.8-3ubuntu0.2
CPE2.3- cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:22.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:23.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:23.10:*:*:*:*:*:*:*
- cpe:2.3:a:canonical:python-cryptography_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:python3-cryptography_ubuntu_package:*:*:*:*:*:ubuntu:*:*
https://ubuntu.com/security/notices/USN-6539-1
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) NULL pointer dereference
EUVDB-ID: #VU83930
Risk: Medium
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2023-49083
CWE-ID:
CWE-476 - NULL Pointer Dereference
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error when calling the load_pem_pkcs7_certificates() or load_der_pkcs7_certificates() functions. A remote attacker can pass specially crafted PKCS7 blob/certificate certificate to the application and perform a denial of service (DoS) attack.
MitigationUpdate the affected package python-cryptography to the latest version.
Vulnerable software versionsUbuntu: 20.04 - 23.10
python-cryptography (Ubuntu package): before 2.8-3ubuntu0.2
python3-cryptography (Ubuntu package): before 2.8-3ubuntu0.2
CPE2.3- cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:22.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:23.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:23.10:*:*:*:*:*:*:*
- cpe:2.3:a:canonical:python-cryptography_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:python3-cryptography_ubuntu_package:*:*:*:*:*:ubuntu:*:*
https://ubuntu.com/security/notices/USN-6539-1
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.
