Amazon Linux 2 : unbound (ALAS-2021-1683)

critical Nessus Plugin ID 151275

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Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of unbound installed on the remote host is prior to 1.7.3-15. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2021-1683 advisory.

2024-01-19: CVE-2019-25033 was added to this advisory.

A flaw was found in unbound. An integer overflow in regional_alloc function may lead to a buffer overflow of the allocated buffer if the size can be controlled by an attacker and can be big enough. The highest threat from this vulnerability is to data confidentiality and integrity as well as service availability.
(CVE-2019-25032)

Unbound before 1.9.5 allows an integer overflow in the regional allocator via the ALIGN_UP macro. NOTE:
The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running Unbound installation cannot be remotely or locally exploited. (CVE-2019-25033)

A flaw was found in unbound. An integer overflow in the sldns_str2wire_dname_buf_origin function may lead to a buffer overflow. The highest threat from this vulnerability is to data confidentiality and integrity as well as service availability. (CVE-2019-25034)

A flaw was found in unbound. An out-of-bounds write in the sldns_bget_token_par function may be abused by a remote attacker. The highest threat from this vulnerability is to data confidentiality and integrity as well as service availability. (CVE-2019-25035)

A flaw was found in unbound. A reachable assertion in the synth_cname function can be triggered by sending invalid packets to the server. If asserts are disabled during compilation, this issue might lead to an out-of-bounds write in dname_pkt_copy function. The highest threat from this vulnerability is to data confidentiality and integrity as well as service availability. (CVE-2019-25036)

A flaw was found in unbound. A reachable assertion in the dname_pkt_copy function can be triggered by sending invalid packets to the server. The highest threat from this vulnerability is to service availability. (CVE-2019-25037)

A flaw was found in unbound. An integer overflow in dnsc_load_local_data function may lead to a buffer overflow of the allocated buffer if the size can be controlled by an attacker. The highest threat from this vulnerability is to data confidentiality and integrity as well as service availability.
(CVE-2019-25038)

A flaw was found in unbound. An integer overflow in ub_packed_rrset_key function may lead to a buffer overflow of the allocated buffer if the size can be controlled by an attacker. The highest threat from this vulnerability is to data confidentiality and integrity as well as service availability.
(CVE-2019-25039)

A flaw was found in unbound. An infinite loop in dname_pkt_copy function could be triggered by a remote attacker. The highest threat from this vulnerability is to service availability. (CVE-2019-25040)

A flaw was found in unbound. A reachable assertion in the dname_pkt_copy function can be triggered through compressed names. The highest threat from this vulnerability is to service availability. (CVE-2019-25041)

A flaw was found in unbound. An out-of-bounds write in the rdata_copy function may be abused by a remote attacker. The highest threat from this vulnerability is to data confidentiality and integrity as well as service availability. (CVE-2019-25042)

A symbolic link traversal vulnerability was found in unbound in the way it writes its PID file while starting up. This flaw allows a local attacker with access to the unbound user to set up a link to another file, owned by root, and make unbound overwrite it during its next restart, destroying the original content. The highest threat from this vulnerability is integrity. (CVE-2020-28935)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Run 'yum update unbound' to update your system.

Plugin Details

Severity: Critical

ID: 151275

File Name: al2_ALAS-2021-1683.nasl

Version: 1.4

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 7/1/2021

Updated: 12/11/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

CVSS Score Source: CVE-2019-25042

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:unbound-devel, p-cpe:/a:amazon:linux:python2-unbound, p-cpe:/a:amazon:linux:unbound-debuginfo, p-cpe:/a:amazon:linux:unbound-libs, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:unbound, p-cpe:/a:amazon:linux:python3-unbound

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

Exploit Ease: No known exploits are available

Patch Publication Date: 7/1/2021

Vulnerability Publication Date: 12/7/2020

Reference Information

CVE: CVE-2019-25032, CVE-2019-25033, CVE-2019-25034, CVE-2019-25035, CVE-2019-25036, CVE-2019-25037, CVE-2019-25038, CVE-2019-25039, CVE-2019-25040, CVE-2019-25041, CVE-2019-25042, CVE-2020-28935

ALAS: 2021-1683

Detections

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