Exploitalert - Database of Exploits

QRadar Community Edition 7.3.1.6 Insecure File Permissions

CVE	Category	Price	Severity
CVE-2020-4270	CWE-269	N/A	High

Author	Risk	Exploitation Type	Date
Unknown	High	Local	2020-04-22

CPE
cpe:cpe:/a:ibm:qradar_community_edition:7.3.1.6

CVSS	EPSS	EPSSP
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Local	AV	The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	Low	PR	The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

https://cxsecurity.com/ascii/WLB-2020040122

QRadar Community Edition 7.3.1.6 Insecure File Permissions

------------------------------------------------------------------------ Local privilege escalation in QRadar due to run-result-reader.sh insecure file permissions ------------------------------------------------------------------------ Yorick Koster, September 2019 ------------------------------------------------------------------------ Abstract ------------------------------------------------------------------------ It was found that the nobody user is owner of the run-result-reader.sh script. This script is executed by the root user's crontab. Due to this it is possible for any process running as nobody to add commands to this script that will be executed with root privileges. In combination with a code execution vulnerability in QRadar's web application, this can be used for attacker's to gain full control of the QRadar system. ------------------------------------------------------------------------ See also ------------------------------------------------------------------------ CVE-2020-4270 [2] 6189657 [3] - IBM QRadar SIEM is vulnerable to privilege escalation (CVE-2020-4270) ------------------------------------------------------------------------ Tested versions ------------------------------------------------------------------------ This issue was successfully verified on QRadar Community Edition [4] version 7.3.1.6 (7.3.1 Build 20180723171558). ------------------------------------------------------------------------ Fix ------------------------------------------------------------------------ IBM has released the following versions of QRader in which this issue has been resolved: - QRadar / QRM / QVM / QNI 7.4.0 GA [5] (SFS) - QRadar / QRM / QVM / QRIF / QNI 7.3.3 Patch 3 [6] (SFS) - QRadar / QRM / QVM / QRIF / QNI 7.3.2 Patch 7 [7] (SFS) - QRadar Incident Forensics 7.4.0 [8] (ISO) - QRadar Incident Forensics 7.4.0 [9] (SFS) ------------------------------------------------------------------------ Introduction ------------------------------------------------------------------------ QRadar [10] is IBM's enterprise SIEM [11] solution. A free version of QRadar is available that is known as QRadar Community Edition [4]. This version is limited to 50 events per second and 5,000 network flows a minute, supports apps, but is based on a smaller footprint for non-enterprise use. A local privilege escalation vulnerability was found in QRadar. This vulnerability is possible because the script located at /opt/qvm/iem/bin/run-result-reader.sh is configured with weak file permissions. The owner of the script is set to the nobody user, which is a low privileged system account use by various services - including QRadar's web application. The script is also started by the root user's crontab. This means that if an attacker manages to gain access to the QRadar system as the nobody user, it would be possible to escalate privileges to root. This is for example possible by exploiting a code execution vulnerability in QRadar's web application. ------------------------------------------------------------------------ Details ------------------------------------------------------------------------ The crontab of the root user contains various entries to run commands on different moments. One of these entries will run the run-result-reader.sh script every 20 minutes: # crontab -l [...] # Update the Endpoint Manager Fixlet Action Results */20 * * * * /opt/qvm/iem/bin/run-result-reader.sh > /var/log/iem-cron.log 2>&1 This script is owned by the nobody user, meaning that this user fully controls the script and thus fully controls which commands will be executed. # ls -la /opt/qvm/iem/bin/run-result-reader.sh -rwxr-xr-x 1 nobody nobody 2592 Sep 12 17:40 /opt/qvm/iem/bin/run-result-reader.sh If the (modified) script is run from root's crontab, the commands within the script will be executed with root privileges. Due to this it is possible for the nobody to exploit this issue to gain root privileges and gain full control of the QRadar system. ------------------------------------------------------------------------ References ------------------------------------------------------------------------ [1] https://www.securify.nl/advisory/SFY20200405/local-privilege-escalation-in-qradar-due-to-run-result-reader_sh-insecure-file-permissions.html [2] https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-4270 [3] https://www.ibm.com/support/pages/node/6189657 [4] https://developer.ibm.com/qradar/ce/ [5] https://www.ibm.com/support/fixcentral/swg/downloadFixes?parent=IBM%20Security&product=ibm/Other+software/IBM+Security+QRadar+SIEM&release=7.4.0&platform=Linux&function=fixId&fixids=7.4.0-QRADAR-QRSIEM-20200304205308&includeRequisites=1&includeSupersedes=0&downloadMethod=http [6] https://www.ibm.com/support/fixcentral/swg/downloadFixes?parent=IBM%20Security&product=ibm/Other+software/IBM+Security+QRadar+SIEM&release=7.3.0&platform=Linux&function=fixId&fixids=7.3.3-QRADAR-QRSIEM-20200409085709&includeRequisites=1&includeSupersedes=0&downloadMethod=http [7] https://www.ibm.com/support/fixcentral/swg/downloadFixes?parent=IBM%20Security&product=ibm/Other+software/IBM+Security+QRadar+SIEM&release=7.3.0&platform=Linux&function=fixId&fixids=7.3.2-QRADAR-QRSIEM-20200406171249&includeRequisites=1&includeSupersedes=0&downloadMethod=http [8] https://www.ibm.com/support/fixcentral/swg/downloadFixes?parent=IBM%20Security&product=ibm/Other+software/IBM+Security+QRadar+Incident+Forensics&release=7.4.0&platform=Linux&function=fixId&fixids=7.4.0-QRADAR-QIFFULL-2019.18.0.20200304205308&includeRequisites=1&includeSupersedes=0&downloadMethod=http [9] https://www.ibm.com/support/fixcentral/swg/downloadFixes?parent=IBM%20Security&product=ibm/Other+software/IBM+Security+QRadar+Incident+Forensics&release=7.4.0&platform=Linux&function=fixId&fixids=7.4.0-QRADAR-QIFSFS-2019.18.0.20200304205308&includeRequisites=1&includeSupersedes=0&downloadMethod=http [10] https://www.ibm.com/security/security-intelligence/qradar [11] https://en.wikipedia.org/wiki/Security_information_and_event_management

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