Vixie cron up to 3.0 force_rescan_user use after free

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.3$0-$5k0.00

Summaryinfo

A vulnerability was found in Vixie cron up to 3.0. It has been rated as problematic. This affects the function force_rescan_user. The manipulation leads to use after free. This vulnerability is traded as CVE-2019-9706. An attack has to be approached locally. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Vixie cron up to 3.0. It has been rated as problematic. This issue affects the function force_rescan_user. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is availability. The summary by CVE is:

Vixie Cron before the 3.0pl1-133 Debian package allows local users to cause a denial of service (use-after-free and daemon crash) because of a force_rescan_user error.

The bug was discovered 12/27/2015. The weakness was shared 03/12/2019 by Florian Weimer (Website). It is possible to read the advisory at lists.debian.org. The identification of this vulnerability is CVE-2019-9706 since 03/11/2019. Attacking locally is a requirement. The successful exploitation requires a simple authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 1171 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176701 (Debian Security Update for cron (DLA 1723-1)).

Upgrading to version 3.0pl1-133 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 107373†). The entries VDB-102225, VDB-131577 and VDB-131578 are related to this item. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Vixie cron 3.0pl1-133
Patch: salsa.debian.org

Timelineinfo

12/27/2015 🔍
03/08/2019 +1167 days 🔍
03/11/2019 +3 days 🔍
03/12/2019 +1 days 🔍
03/12/2019 +0 days 🔍
07/31/2023 +1602 days 🔍

Sourcesinfo

Advisory: DLA 1723-1
Researcher: Florian Weimer
Status: Confirmed

CVE: CVE-2019-9706 (🔍)
GCVE (CVE): GCVE-0-2019-9706
GCVE (VulDB): GCVE-100-131579
SecurityFocus: 107373 - Vixie Cron CVE-2019-9704 Use After Free Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 03/12/2019 07:18
Updated: 07/31/2023 14:44
Changes: 03/12/2019 07:18 (60), 05/15/2020 15:43 (5), 07/31/2023 14:44 (5)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to stay up to date on a daily basis?

Enable the mail alert feature now!