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CVE-2023-27538

Publication date 20 March 2023

Last updated 24 July 2024

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

5.5 · Medium

Score breakdown

An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration check, allowing them to match easily, potentially leading to the reuse of an inappropriate connection.

Read the notes from the security team

Status

Package Ubuntu Release Status
curl 23.04 lunar
Fixed 7.88.1-6ubuntu2
22.10 kinetic
Fixed 7.85.0-1ubuntu0.5
22.04 LTS jammy
Fixed 7.81.0-1ubuntu1.10
20.04 LTS focal
Fixed 7.68.0-1ubuntu2.18
18.04 LTS bionic
Fixed 7.58.0-2ubuntu3.24
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Notes

mdeslaur

incomplete fix for CVE-2022-27782

Patch details

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

Package Patch details
curl

Severity score breakdown

Parameter Value
Base score 5.5 · Medium
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

Related Ubuntu Security Notices (USN)

Other references