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ubuntucveUbuntu.comUB:CVE-2021-3733
HistorySep 02, 2021 - 12:00 a.m.

CVE-2021-3733

2021-09-0200:00:00
ubuntu.com
ubuntu.com
33

4 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

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

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

0.003 Low

EPSS

Percentile

71.7%

JSON

There’s a flaw in urllib’s AbstractBasicAuthHandler class. An attacker who
controls a malicious HTTP server that an HTTP client (such as web browser)
connects to, could trigger a Regular Expression Denial of Service (ReDOS)
during an authentication request with a specially crafted payload that is
sent by the server to the client. The greatest threat that this flaw poses
is to application availability.

Notes

Author Note
leosilva code affected in hirsute and devel is already patched, so both releases in python3.9 are not affected.
OSVersionArchitecturePackageVersionFilename
ubuntu21.04noarchpython3.10< 3.10.0~b1-3~21.04UNKNOWN
ubuntu14.04noarchpython3.4< 3.4.3-1ubuntu1~14.04.7+esm11UNKNOWN
ubuntu14.04noarchpython3.5< anyUNKNOWN
ubuntu16.04noarchpython3.5< 3.5.2-2ubuntu0~16.04.13+esm1UNKNOWN
ubuntu18.04noarchpython3.6< 3.6.9-1~18.04ubuntu1.6UNKNOWN
ubuntu18.04noarchpython3.7< 3.7.5-2ubuntu1~18.04.2UNKNOWN
ubuntu18.04noarchpython3.8< 3.8.0-3ubuntu1~18.04.2UNKNOWN
ubuntu20.04noarchpython3.8< 3.8.10-0ubuntu1~20.04UNKNOWN
ubuntu20.04noarchpython3.9< 3.9.5-3~20.04.1UNKNOWN

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4 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

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

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

0.003 Low

EPSS

Percentile

71.7%

JSON
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