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ubuntucveUbuntu.comUB:CVE-2021-22946
HistorySep 15, 2021 - 12:00 a.m.

CVE-2021-22946

2021-09-1500:00:00
ubuntu.com
ubuntu.com
25
vulnerability
curl
tls bypass
sensitive data
network exposure

CVSS2

5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

EPSS

0.003

Percentile

69.8%

JSON

A user can tell curl >= 7.20.0 and <= 7.78.0 to require a successful
upgrade to TLS when speaking to an IMAP, POP3 or FTP server (--ssl-reqd
on the command line orCURLOPT_USE_SSL set to CURLUSESSL_CONTROL or
CURLUSESSL_ALL withlibcurl). This requirement could be bypassed if the
server would return a properly crafted but perfectly legitimate
response.This flaw would then make curl silently continue its operations
withoutTLS contrary to the instructions and expectations, exposing
possibly sensitive data in clear text over the network.

Notes

Author Note
mdeslaur introduced by: https://github.com/curl/curl/commit/ec3bb8f727405 and https://github.com/curl/curl/commit/c5ba0c2f544653
OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchcurl< 7.58.0-2ubuntu3.15UNKNOWN
ubuntu20.04noarchcurl< 7.68.0-1ubuntu2.7UNKNOWN
ubuntu21.04noarchcurl< 7.74.0-1ubuntu2.3UNKNOWN
ubuntu21.10noarchcurl< 7.74.0-1.3ubuntu2UNKNOWN
ubuntu22.04noarchcurl< 7.74.0-1.3ubuntu2UNKNOWN
ubuntu14.04noarchcurl< 7.35.0-1ubuntu2.20+esm8UNKNOWN
ubuntu16.04noarchcurl< 7.47.0-1ubuntu2.19+esm1UNKNOWN

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CVSS2

5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

EPSS

0.003

Percentile

69.8%

JSON
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