libtar Tar File malloc gnu_longlink 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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6.6$0-$5k0.00

Summaryinfo

A vulnerability was found in libtar. It has been rated as problematic. The impacted element is the function malloc of the component Tar File Handler. This manipulation of the argument gnu_longlink causes out-of-bounds. The identification of this vulnerability is CVE-2021-33643. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in libtar (version unknown) and classified as problematic. Affected by this vulnerability is the function malloc of the component Tar File Handler. The manipulation of the argument gnu_longlink with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality. The summary by CVE is:

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_longlink, causing an out-of-bounds read.

The weakness was shared 08/11/2022. It is possible to read the advisory at openeuler.org. This vulnerability is known as CVE-2021-33643 since 05/28/2021. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

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). Statistical analysis made it clear that VulDB provides the best quality 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: 6.6
VulDB Meta Temp Score: 6.6

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

NVD Base Score: 9.1
NVD Vector: 🔍

ADP CISA Base Score: 6.5
ADP CISA 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 🔍
06/23/2026 +1412 days 🔍

Sourcesinfo

Advisory: openeuler.org
Status: Confirmed

CVE: CVE-2021-33643 (🔍)
GCVE (CVE): GCVE-0-2021-33643
GCVE (VulDB): GCVE-100-206059
CERT Bund: WID-SEC-2023-1238 - Red Hat Enterprise Linux: Mehrere Schwachstellen in verschiedenen Komponenten

Entryinfo

Created: 08/11/2022 07:12
Updated: 06/23/2026 19:07
Changes: 08/11/2022 07:12 (38), 08/11/2022 07:13 (1), 09/04/2022 13:21 (11), 01/29/2025 06:32 (16), 04/02/2025 21:00 (1), 04/30/2025 12:55 (3), 01/04/2026 02:16 (7), 06/23/2026 19:07 (10)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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