libtirpc up to 0.3.3-rc2 File Descriptors makefd_xprt file descriptor consumption

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.00

A vulnerability was found in libtirpc up to 0.3.3-rc2. It has been rated as problematic. Affected by this issue is the function makefd_xprt of the component File Descriptors. The manipulation with an unknown input leads to a file descriptor consumption vulnerability. Using CWE to declare the problem leads to CWE-769. This entry has been deprecated because it was a duplicate of CWE-774. All content has been transferred to CWE-774. Impacted is availability. CVE summarizes:

A null-pointer dereference vulnerability was found in libtirpc before version 0.3.3-rc3. The return value of makefd_xprt() was not checked in all instances, which could lead to a crash when the server exhausted the maximum number of available file descriptors. A remote attacker could cause an rpc-based application to crash by flooding it with new connections.

The bug was discovered 08/22/2018. The weakness was released 08/30/2018 as confirmed git commit (GIT Repository). The advisory is shared for download at git.linux-nfs.org. This vulnerability is handled as CVE-2018-14622 since 07/27/2018. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 8 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 112226 (Debian DLA-1487-1 : libtirpc security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171637 (SUSE Enterprise Linux Security Update for libtirpc (SUSE-SU-2018:3146-1)).

Upgrading to version 0.3.3-rc3 eliminates this vulnerability. Applying a patch 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 patching the affected component. A possible mitigation has been published 2 days after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (112226). Entry connected to this vulnerability is available at 123415.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 6.0

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 5.3
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: File descriptor consumption
CWE: CWE-769 / CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Nessus ID: 112226
Nessus Name: Debian DLA-1487-1 : libtirpc security update
Nessus File: 🔍
Nessus Risk: 🔍
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Nessus Context: 🔍

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Qualys Name: 🔍

Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: libtirpc 0.3.3-rc3
Patch: 1c77f7a869bdea2a34799d774460d1f9983d45f0

Timelineinfo

07/27/2018 🔍
08/22/2018 +26 days 🔍
08/30/2018 +7 days 🔍
08/30/2018 +0 days 🔍
08/31/2018 +1 days 🔍
08/31/2018 +0 days 🔍
09/04/2018 +4 days 🔍
05/06/2023 +1705 days 🔍

Sourcesinfo

Advisory: USN-3759-1
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-14622 (🔍)
See also: 🔍

Entryinfo

Created: 08/31/2018 07:01
Updated: 05/06/2023 10:13
Changes: 08/31/2018 07:01 (75), 03/19/2020 15:20 (3), 05/06/2023 10:07 (5), 05/06/2023 10:13 (12)
Complete: 🔍

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