Detections
Analytics

RHEL 8 : libyang (Unpatched Vulnerability)

high Nessus Plugin ID 195699

Synopsis

The remote Red Hat 8 host is affected by multiple vulnerabilities that will not be patched.

Description

The remote Redhat Enterprise Linux 8 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

 - libyang: NULL pointer dereference in read_yin_leaf() (CVE-2021-28906)

 - libyang: NULL pointer dereference via lysp_stmt_validate_value at lys_parse_mem.c (CVE-2023-26917)

 - In function read_yin_container() in libyang <= v1.0.225, it doesn't check whether the value of retval->ext[r] is NULL. In some cases, it can be NULL, which leads to the operation of retval->ext[r]->flags that results in a crash. (CVE-2021-28902)

 - A stack overflow in libyang <= v1.0.225 can cause a denial of service through function lyxml_parse_mem().
 lyxml_parse_elem() function will be called recursively, which will consume stack space and lead to crash.
 (CVE-2021-28903)

 - In function ext_get_plugin() in libyang <= v1.0.225, it doesn't check whether the value of revision is NULL. If revision is NULL, the operation of strcmp(revision, ext_plugins[u].revision) will lead to a crash. (CVE-2021-28904)

 - In function lys_node_free() in libyang <= v1.0.225, it asserts that the value of node->module can't be NULL. But in some cases, node->module can be null, which triggers a reachable assertion (CWE-617).
 (CVE-2021-28905)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

Solution

The vendor has acknowledged the vulnerabilities but no solution has been provided. Refer to the vendor for remediation guidance.

Plugin Details

Severity: High

ID: 195699

File Name: redhat_unpatched-libyang-rhel8.nasl

Version: 1.1

Type: local

Agent: unix

Published: 5/11/2024

Updated: 5/13/2024

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 4.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2021-28906

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 7.2

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:H/RL:O/RC:C

CVSS Score Source: CVE-2023-26917

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:redhat:enterprise_linux:libyang

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 5/20/2021

Reference Information

CVE: CVE-2021-28902, CVE-2021-28903, CVE-2021-28904, CVE-2021-28905, CVE-2021-28906, CVE-2023-26917