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ubuntucveUbuntu.comUB:CVE-2021-42013
HistoryOct 07, 2021 - 12:00 a.m.

CVE-2021-42013

2021-10-0700:00:00
ubuntu.com
ubuntu.com
48

7.5 High

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

0.975 High

EPSS

Percentile

100.0%

JSON

It was found that the fix for CVE-2021-41773 in Apache HTTP Server 2.4.50
was insufficient. An attacker could use a path traversal attack to map URLs
to files outside the directories configured by Alias-like directives. If
files outside of these directories are not protected by the usual default
configuration β€œrequire all denied”, these requests can succeed. If CGI
scripts are also enabled for these aliased pathes, this could allow for
remote code execution. This issue only affects Apache 2.4.49 and Apache
2.4.50 and not earlier versions.

Notes

Author Note
seth-arnold Ubuntu wasn’t vulnerable to CVE-2021-41773 so we did not deploy the insufficient fix.

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7.5 High

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

0.975 High

EPSS

Percentile

100.0%

JSON
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