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Denial of service (DoS) when processing Git credentials

Moderate severity GitHub Reviewed Published Jan 25, 2023 in rancher/wrangler • Updated Feb 14, 2023

Package

gomod github.com/rancher/wrangler (Go)

Affected versions

<= 0.7.3
>= 0.8.0, <= 0.8.4
= 1.0.0
>= 0.8.6, < 0.8.11

Patched versions

0.7.4-security1
0.8.5-security1
1.0.1
0.8.11

Description

Impact

A denial of services (DoS) vulnerability was discovered in Wrangler Git package affecting versions up to and including v1.0.0.

Specially crafted Git credentials can result in a denial of service (DoS) attack on an application that uses Wrangler due to the exhaustion of the available memory and CPU resources. This is caused by a lack of input validation of Git credentials before they are used, which may lead to a denial of service in some cases. This issue can be triggered when accessing both private and public Git repositories.

Workarounds

A workaround is to sanitize input passed to the Git package to remove potential unsafe and ambiguous characters. Otherwise, the best course of action is to update to a patched Wrangler version.

Patches

Patched versions include v1.0.1 and later and the backported tags - v0.7.4-security1, v0.8.5-security1 and v0.8.11.

For more information

If you have any questions or comments about this advisory:

References

@macedogm macedogm published to rancher/wrangler Jan 25, 2023
Published to the GitHub Advisory Database Jan 25, 2023
Reviewed Jan 25, 2023
Published by the National Vulnerability Database Feb 7, 2023
Last updated Feb 14, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H

EPSS score

0.144%
(52nd percentile)

Weaknesses

CVE ID

CVE-2022-43756

GHSA ID

GHSA-8fcj-gf77-47mg

Source code

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