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Maliciously crafted Git server replies can cause DoS on go-git clients

High severity GitHub Reviewed Published Dec 24, 2023 in go-git/go-git • Updated Jan 23, 2024

Package

gomod github.com/go-git/go-git/v5 (Go)

Affected versions

>= 4.0.0, < 5.11.0

Patched versions

5.11.0
gomod gopkg.in/src-d/go-git.v4 (Go)
>= 4.7.1
None

Description

Impact

A denial of service (DoS) vulnerability was discovered in go-git versions prior to v5.11. This vulnerability allows an attacker to perform denial of service attacks by providing specially crafted responses from a Git server which triggers resource exhaustion in go-git clients.

Applications using only the in-memory filesystem supported by go-git are not affected by this vulnerability.
This is a go-git implementation issue and does not affect the upstream git cli.

Patches

Users running versions of go-git from v4 and above are recommended to upgrade to v5.11 in order to mitigate this vulnerability.

Workarounds

In cases where a bump to the latest version of go-git is not possible, we recommend limiting its use to only trust-worthy Git servers.

Credit

Thanks to Ionut Lalu for responsibly disclosing this vulnerability to us.

References

References

@mcuadros mcuadros published to go-git/go-git Dec 24, 2023
Published to the GitHub Advisory Database Dec 27, 2023
Reviewed Dec 27, 2023
Published by the National Vulnerability Database Jan 12, 2024
Last updated Jan 23, 2024

Severity

High

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
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
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:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

0.046%
(18th percentile)

Weaknesses

CVE ID

CVE-2023-49568

GHSA ID

GHSA-mw99-9chc-xw7r

Source code

Credits

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