Fedora 23 : opensmtpd-5.7.3p1-1.fc23 (2015-ed1c673f09)

critical Nessus Plugin ID 89451

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Synopsis

The remote Fedora host is missing a security update.

Description

Issues fixed in this release (since 5.7.2): - fix an mda buffer truncation bug which allows a user to create forward files that pass session checks but fail delivery later down the chain, within the user mda; - fix remote buffer overflow in unprivileged pony process; - reworked offline enqueue to better protect against hardlink attacks.
---- Several vulnerabilities have been fixed in OpenSMTPD 5.7.2: - an oversight in the portable version of fgetln() that allows attackers to read and write out-of-bounds memory; - multiple denial-of- service vulnerabilities that allow local users to kill or hang OpenSMTPD; - a stack-based buffer overflow that allows local users to crash OpenSMTPD, or execute arbitrary code as the non-chrooted _smtpd user;
- a hardlink attack (or race-conditioned symlink attack) that allows local users to unset the chflags() of arbitrary files; - a hardlink attack that allows local users to read the first line of arbitrary files (for example, root's hash from /etc/master.passwd); - a denial-of-service vulnerability that allows remote attackers to fill OpenSMTPD's queue or mailbox hard-disk partition; - an out- of-bounds memory read that allows remote attackers to crash OpenSMTPD, or leak information and defeat the ASLR protection; - a use-after-free vulnerability that allows remote attackers to crash OpenSMTPD, or execute arbitrary code as the non-chrooted _smtpd user; Further details can be found in Qualys' audit report:
http://seclists.org/oss-sec/2015/q4/17 MITRE has assigned one CVE for the use-after-free vulnerability; additional CVEs may be assigned:
http://seclists.org/oss-sec/2015/q4/23 External References:
https://www.opensmtpd.org/announces/release-5.7.2.txt http://seclists.org/oss- sec/2015/q4/17

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected opensmtpd package.

Plugin Details

Severity: Critical

ID: 89451

File Name: fedora_2015-ed1c673f09.nasl

Version: 1.6

Type: local

Agent: unix

Family: Fedora Local Security Checks

Published: 3/4/2016

Updated: 1/11/2021

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.5

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

CVSS v3

Risk Factor: Critical

Base Score: 9.8

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

Vulnerability Information

CPE: cpe:/o:fedoraproject:fedora:23, p-cpe:/a:fedoraproject:fedora:opensmtpd

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

Patch Publication Date: 10/31/2015

Reference Information

CVE: CVE-2015-7687

FEDORA: 2015-ed1c673f09

Detections

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