VDB-128499 · CVE-2018-20532 · RHSA-2019:2290

libsolv up to 0.7.2 ext/testcase.c testcase_read null pointer dereference

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.
5.4	$0-$5k	0.00

Summaryinfo

A vulnerability was found in libsolv up to 0.7.2. It has been rated as problematic. This affects the function testcase_read of the file ext/testcase.c. Performing a manipulation results in null pointer dereference. This vulnerability is cataloged as CVE-2018-20532. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in libsolv up to 0.7.2. It has been classified as problematic. This affects the function testcase_read of the file ext/testcase.c. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. The summary by CVE is:

There is a NULL pointer dereference at ext/testcase.c (function testcase_read) in libsolvext.a in libsolv through 0.7.2 that will cause a denial of service.

The bug was discovered 12/13/2018. The weakness was shared 12/28/2018 (Website). It is possible to read the advisory at bugzilla.redhat.com. This vulnerability is uniquely identified as CVE-2018-20532 since 12/27/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. 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 15 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 197400 (Ubuntu Security Notification for Libsolv Vulnerabilities (USN-3916-1)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The entries VDB-128500 and VDB-128501 are related to this item. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

libsolv

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.4

VulDB Base Score: 4.3
VulDB Temp Score: 4.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Patch: github.com

Timelineinfo

12/13/2018 🔍
12/27/2018 +14 days 🔍
12/28/2018 +1 days 🔍
12/28/2018 +0 days 🔍
12/29/2018 +1 days 🔍
06/22/2023 +1636 days 🔍

Sourcesinfo

Advisory: RHSA-2019:2290
Status: Confirmed

CVE: CVE-2018-20532 (🔍)
GCVE (CVE): GCVE-0-2018-20532
GCVE (VulDB): GCVE-100-128499
See also: 🔍

Entryinfo

Created: 12/29/2018 17:24
Updated: 06/22/2023 11:03
Changes: 12/29/2018 17:24 (59), 04/24/2020 20:45 (1), 06/22/2023 11:03 (4)
Complete: 🔍
Cache ID: 216::103

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