Detections
Analytics
Oracle Linux 8 : unbound (ELSA-2021-1853)
critical Nessus Plugin ID 149938
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Synopsis
The remote Oracle Linux host is missing one or more security updates.Description
The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-1853 advisory.- Unbound before 1.9.5 allows an integer overflow in a size calculation in dnscrypt/dnscrypt.c.
(CVE-2019-25038)
- Unbound before 1.9.5 allows an infinite loop via a compressed name in dname_pkt_copy. (CVE-2019-25040)
- Unbound before 1.9.5 allows an out-of-bounds write via a compressed name in rdata_copy. (CVE-2019-25042)
- Unbound before 1.9.5 allows an integer overflow in the regional allocator via regional_alloc.
(CVE-2019-25032)
- Unbound before 1.9.5 allows an integer overflow in sldns_str2wire_dname_buf_origin, leading to an out-of- bounds write. (CVE-2019-25034)
- Unbound before 1.9.5 allows an out-of-bounds write in sldns_bget_token_par. (CVE-2019-25035)
- Unbound before 1.9.5 allows an assertion failure and denial of service in synth_cname. (CVE-2019-25036)
- Unbound before 1.9.5 allows an assertion failure and denial of service in dname_pkt_copy via an invalid packet. (CVE-2019-25037)
- Unbound before 1.9.5 allows an integer overflow in a size calculation in respip/respip.c. (CVE-2019-25039)
- Unbound before 1.9.5 allows an assertion failure via a compressed name in dname_pkt_copy. (CVE-2019-25041)
- NLnet Labs Unbound, up to and including version 1.12.0, and NLnet Labs NSD, up to and including version 4.3.3, contain a local vulnerability that would allow for a local symlink attack. When writing the PID file, Unbound and NSD create the file if it is not there, or open an existing file for writing. In case the file was already present, they would follow symlinks if the file happened to be a symlink instead of a regular file. An additional chown of the file would then take place after it was written, making the user Unbound/NSD is supposed to run as the new owner of the file. If an attacker has local access to the user Unbound/NSD runs as, she could create a symlink in place of the PID file pointing to a file that she would like to erase. If then Unbound/NSD is killed and the PID file is not cleared, upon restarting with root privileges, Unbound/NSD will rewrite any file pointed at by the symlink. This is a local vulnerability that could create a Denial of Service of the system Unbound/NSD is running on. It requires an attacker having access to the limited permission user Unbound/NSD runs as and point through the symlink to a critical file on the system. (CVE-2020-28935)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Update the affected packages.See Also
Plugin Details
Severity: Critical
ID: 149938
File Name: oraclelinux_ELSA-2021-1853.nasl
Version: 1.2
Type: local
Agent: unix
Published: 5/26/2021
Updated: 5/26/2021
Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.7
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: cpe:/o:oracle:linux:8, p-cpe:/a:oracle:linux:python3-unbound, p-cpe:/a:oracle:linux:unbound, p-cpe:/a:oracle:linux:unbound-devel, p-cpe:/a:oracle:linux:unbound-libs
Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/OracleLinux
Exploit Ease: No known exploits are available
Patch Publication Date: 5/25/2021
Vulnerability Publication Date: 12/7/2020
Reference Information
CVE: CVE-2019-25032, 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