sigstore gitsign 0.6.x/0.7.x Rekor API signature verification

CVSS Meta Temp Score
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CTI Interest Score
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3.8$0-$5k0.00

Summaryinfo

A vulnerability has been found in sigstore gitsign 0.6.x/0.7.x and classified as problematic. Impacted is an unknown function of the component Rekor API. This manipulation causes signature verification. This vulnerability is registered as CVE-2023-47122. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in sigstore gitsign 0.6.x/0.7.x and classified as problematic. Affected by this vulnerability is an unknown part of the component Rekor API. The manipulation with an unknown input leads to a signature verification vulnerability. The CWE definition for the vulnerability is CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. As an impact it is known to affect integrity. The summary by CVE is:

Gitsign is software for keyless Git signing using Sigstore. In versions of gitsign starting with 0.6.0 and prior to 0.8.0, Rekor public keys were fetched via the Rekor API, instead of through the local TUF client. If the upstream Rekor server happened to be compromised, gitsign clients could potentially be tricked into trusting incorrect signatures. There is no known compromise the default public good instance (`rekor.sigstore.dev`) - anyone using this instance is unaffected. This issue was fixed in v0.8.0. No known workarounds are available.

The weakness was published 11/11/2023 as GHSA-xvrc-2wvh-49vc. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2023-47122 since 10/30/2023. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 0.8.0 eliminates this vulnerability. Applying the patch cd66ccb03c86a3600955f0c15f6bfeb75f697236 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.8
VulDB Meta Temp Score: 3.8

VulDB Base Score: 2.0
VulDB Temp Score: 1.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔍

CNA Base Score: 4.2
CNA Vector (GitHub, Inc.): 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Signature verification
CWE: CWE-347 / CWE-345
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: gitsign 0.8.0
Patch: cd66ccb03c86a3600955f0c15f6bfeb75f697236

Timelineinfo

10/30/2023 🔍
11/11/2023 +12 days 🔍
11/11/2023 +0 days 🔍
12/06/2023 +25 days 🔍

Sourcesinfo

Product: github.com

Advisory: GHSA-xvrc-2wvh-49vc
Status: Confirmed

CVE: CVE-2023-47122 (🔍)
GCVE (CVE): GCVE-0-2023-47122
GCVE (VulDB): GCVE-100-244975

Entryinfo

Created: 11/11/2023 01:23
Updated: 12/06/2023 10:34
Changes: 11/11/2023 01:23 (52), 12/06/2023 10:34 (11)
Complete: 🔍
Cache ID: 216::103

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