CVE-2021-22924

Publication date 21 July 2021

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse, if one of them matches the setup.Due to errors in the logic, the config matching function did not take 'issuercert' into account and it compared the involved paths *case insensitively*,which could lead to libcurl reusing wrong connections.File paths are, or can be, case sensitive on many systems but not all, and caneven vary depending on used file systems.The comparison also didn't include the 'issuer cert' which a transfer can setto qualify how to verify the server certificate.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
curl	23.04 lunar	Fixed 7.74.0-1.2ubuntu4
	22.10 kinetic	Fixed 7.74.0-1.2ubuntu4
	22.04 LTS jammy	Fixed 7.74.0-1.2ubuntu4
	21.10 impish	Fixed 7.74.0-1.2ubuntu4
	21.04 hirsute	Fixed 7.74.0-1ubuntu2.1
	20.10 groovy	Ignored
	20.04 LTS focal	Fixed 7.68.0-1ubuntu2.6
	18.04 LTS bionic	Fixed 7.58.0-2ubuntu3.14
	16.04 LTS xenial	Ignored
	14.04 LTS trusty	Ignored

Notes

mdeslaur

introduced in 7.10.4

rodrigo-zaiden

although the issue was introduced in 7.10.4, versions earlier than 7.52.0 would need at least parts of commit cb4e2be7 so the fix for this CVE can be applied. this change seems quite intrusive and there is a high risk of regressions. hence, versions earlier than 7.52 will be ignored.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
curl	Upstream: 5ea3145

Severity score breakdown

Parameter	Value
Base score	3.7 · Low
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

References

Related Ubuntu Security Notices (USN)

USN-5021-1
curl vulnerabilities
22 July 2021