Mgetty up to 1.2.0 faxrec.c fax_notify_mail mail_to memory corruption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Mgetty up to 1.2.0. This impacts the function fax_notify_mail of the file faxrec.c. Executing a manipulation of the argument mail_to as part of Parameter can lead to memory corruption. This vulnerability is tracked as CVE-2018-16745. The attack is restricted to local execution. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in Mgetty up to 1.2.0. This vulnerability affects the function fax_notify_mail of the file faxrec.c. The manipulation of the argument mail_to as part of a Parameter leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered in mgetty before 1.2.1. In fax_notify_mail() in faxrec.c, the mail_to parameter is not sanitized. It could allow a buffer overflow if long untrusted input can reach it.

The bug was discovered 09/11/2018. The weakness was disclosed 09/13/2018 (Website). The advisory is shared for download at x41-dsec.de. This vulnerability was named CVE-2018-16745 since 09/09/2018. The exploitation appears to be easy. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 117855 (openSUSE Security Update : mgetty (openSUSE-2018-1080)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171593 (SUSE Enterprise Linux Security Update for mgetty (SUSE-SU-2018:2850-1)).

Upgrading to version 1.2.1 eliminates this vulnerability. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (117855). The entries VDB-124008, VDB-124009, VDB-124010 and VDB-124011 are pretty similar. Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 117855
Nessus Name: openSUSE Security Update : mgetty (openSUSE-2018-1080)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Mgetty 1.2.1

Timelineinfo

09/09/2018 🔍
09/11/2018 +2 days 🔍
09/13/2018 +1 days 🔍
09/13/2018 +0 days 🔍
09/14/2018 +1 days 🔍
09/28/2018 +14 days 🔍
10/01/2018 +3 days 🔍
03/23/2020 +539 days 🔍

Sourcesinfo

Advisory: x41-dsec.de
Status: Confirmed

CVE: CVE-2018-16745 (🔍)
GCVE (CVE): GCVE-0-2018-16745
GCVE (VulDB): GCVE-100-124012
See also: 🔍

Entryinfo

Created: 09/14/2018 07:12
Updated: 03/23/2020 15:50
Changes: 09/14/2018 07:12 (75), 03/23/2020 15:50 (2)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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