QID 198611

Date Published: 2021-12-20

QID 198611: Ubuntu Security Notification for Python Vulnerabilities (USN-5200-1)

The urllib.
The python urllib http client could enter into an infiniteloop when incorrectly handling certain server responses (100 continue response).

Abstractbasicauthhandler classin python contains regex allowing for catastrophic backtracking.
Speciallycrafted traffic from a malicious http server could cause a regular expressiondenial of service (redos) condition for a client.
Abstractbasicauthhandler classin python contains regex with a quadratic worst-case time complexity.
Specially crafted traffic from a malicious http server could cause a regularexpression denial of service (redos) condition for a client.
Specially crafted traffic from a malicious http server could cause a denial ofservice (dos) condition for a client.

CVSS V3 rated as High - 6.5 severity.

CVSS V2 rated as High - 7.1 severity.

Solution

Refer to Ubuntu security advisory USN-5200-1 for updates and patch information.

Vendor References

USN-5200-1 - ubuntu.com/security/notices/USN-5200-1

CVEs related to QID 198611

CVE-2020-8492 | CVE-2021-3737 | CVE-2021-3733 |

Software Advisories

Advisory ID	Software	Component	Link
USN-5200-1	Ubuntu Linux		ubuntu.com/security/notices/USN-5200-1

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