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Python 2.7.x <= 2.7.17, 3.5 <= 3.5.9, 3.6.x <= 3.6.10, 3.7.x <= 3.7.6, 3.8.x <= 3.8.1 Regular Expression Denial of Service (ReDoS) Vulnerability (MAC OS X)

Information

Severity

Severity

Medium

Family

Family

Denial of Service

CVSSv2 Base

CVSSv2 Base

5.0

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Solution Type

Solution Type

None Solution Available

Created

Created

2 years ago

Modified

Modified

2 years ago

Summary

Python is prone to a Regular Expresson Denial of Service (ReDoS) vulnerability.

Insight

Insight

The AbtractBasicAuthHandler class of the urllib.request module uses an inefficient regular expression (catastrophic backtracking) which can be exploited by an attacker to cause a denial of service.

Affected Software

Affected Software

Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1

Detection Method

Detection Method

Checks if a vulnerable version is present on the target host.

Solution

Solution

No known solution is available as of 17th February, 2020. Information regarding this issue will be updated once solution details are available.

Common Vulnerabilities and Exposures (CVE)