FreeBSD : dovecot -- Buffer overflow reading extension header (7862213c-5152-11e9-8b26-a4badb296695)

high Nessus Plugin ID 123481

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Synopsis

The remote FreeBSD host is missing a security-related update.

Description

Aki Tuomi reports :

Vulnerability Details : When reading FTS or POP3-UIDL header from dovecot index, the input buffer size is not bound, and data is copied to target structure causing stack overflow.

Risk : This can be used for local root privilege escalation or executing arbitrary code in dovecot process context. This requires ability to directly modify dovecot indexes. Steps to reproduce :
Produce dovecot.index.log entry that creates an FTS header which has more than 12 bytes of data. Trigger dovecot indexer-worker or run doveadm index. Dovecot will crash.

Mitigations : Since 2.3.0 dovecot has been compiled with stack smash protection, ASLR, read-only GOT tables and other techniques that make exploiting this bug much harder.

Solution

Update the affected package.

Plugin Details

Severity: High

ID: 123481

File Name: freebsd_pkg_7862213c515211e98b26a4badb296695.nasl

Version: 1.3

Type: local

Family: FreeBSD Local Security Checks

Published: 3/29/2019

Updated: 1/27/2020

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/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:freebsd:freebsd:dovecot, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 3/28/2019

Vulnerability Publication Date: 2/5/2019

Reference Information

CVE: CVE-2019-7524

Detections

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