libtirpc up to 1.3.2 svc_run file descriptor consumption

CVSS Meta Temp Score
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CTI Interest Score
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4.1$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in libtirpc up to 1.3.2. This affects the function svc_run. Executing a manipulation can lead to file descriptor consumption. This vulnerability is registered as CVE-2021-46828. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic was found in libtirpc up to 1.3.2. This vulnerability affects the function svc_run. The manipulation with an unknown input leads to a file descriptor consumption vulnerability. The CWE definition for the vulnerability is CWE-769. This entry has been deprecated because it was a duplicate of CWE-774. All content has been transferred to CWE-774. As an impact it is known to affect availability. CVE summarizes:

In libtirpc before 1.3.3rc1, remote attackers could exhaust the file descriptors of a process that uses libtirpc because idle TCP connections are mishandled. This can, in turn, lead to an svc_run infinite loop without accepting new connections.

The weakness was published 07/20/2022. The advisory is shared for download at git.linux-nfs.org. This vulnerability was named CVE-2021-46828 since 07/20/2022. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 232282 (Amazon Linux 2023 : libtirpc, libtirpc-devel (ALAS2023-2025-890)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.3.3rc1 eliminates this vulnerability. Applying the patch 86529758570cef4c73fb9b9c4104fdc510f701ed is able to eliminate this problem. The bugfix is ready for download at git.linux-nfs.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (232282). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

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

CVSSv2info

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

Exploitinginfo

Class: File descriptor consumption
CWE: CWE-769 / CWE-400 / CWE-404
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: 232282
Nessus Name: Amazon Linux 2023 : libtirpc, libtirpc-devel (ALAS2023-2025-890)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: libtirpc 1.3.3rc1
Patch: 86529758570cef4c73fb9b9c4104fdc510f701ed

Timelineinfo

07/20/2022 🔍
07/20/2022 +0 days 🔍
07/20/2022 +0 days 🔍
03/07/2025 +961 days 🔍

Sourcesinfo

Advisory: DLA 3071-1
Status: Confirmed

CVE: CVE-2021-46828 (🔍)
GCVE (CVE): GCVE-0-2021-46828
GCVE (VulDB): GCVE-100-204580

Entryinfo

Created: 07/20/2022 12:56
Updated: 03/07/2025 13:30
Changes: 07/20/2022 12:56 (41), 08/15/2022 11:10 (1), 03/07/2025 13:30 (16)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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