libtar Tar File malloc gnu_longname out-of-bounds

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in libtar. This affects the function malloc of the component Tar File Handler. Such manipulation of the argument gnu_longname leads to out-of-bounds. This vulnerability is referenced as CVE-2021-33644. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in libtar (affected version unknown) and classified as problematic. Affected by this issue is the function malloc of the component Tar File Handler. The manipulation of the argument gnu_longname with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality. CVE summarizes:

An attacker who submits a crafted tar file with size in header struct being 0 may be able to trigger an calling of malloc(0) for a variable gnu_longname, causing an out-of-bounds read.

The weakness was published 08/11/2022. The advisory is shared for download at openeuler.org. This vulnerability is handled as CVE-2021-33644 since 05/28/2021. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 214740 (Debian dla-4033 : libtar-dev - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (214740) and CERT Bund (WID-SEC-2023-1238). Once again VulDB remains the best source for vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Oracle Linux
  • Red Hat Enterprise Linux
  • RESF Rocky Linux

Productinfo

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.1
NVD Vector: 🔍

CVSSv2info

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

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
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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Nessus ID: 214740
Nessus Name: Debian dla-4033 : libtar-dev - security update

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

05/28/2021 🔍
08/11/2022 +440 days 🔍
08/11/2022 +0 days 🔍
01/04/2026 +1242 days 🔍

Sourcesinfo

Advisory: openeuler.org
Status: Confirmed

CVE: CVE-2021-33644 (🔍)
GCVE (CVE): GCVE-0-2021-33644
GCVE (VulDB): GCVE-100-206060
CERT Bund: WID-SEC-2023-1238 - Red Hat Enterprise Linux: Mehrere Schwachstellen in verschiedenen Komponenten

Entryinfo

Created: 08/11/2022 07:14
Updated: 01/04/2026 02:16
Changes: 08/11/2022 07:14 (39), 01/29/2025 06:32 (16), 04/02/2025 21:00 (12), 04/30/2025 12:55 (3), 01/04/2026 02:16 (7)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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