Local Privilege Escalation via qagent_uninstall.sh Qualys Cloud Agents

The Qualys Cloud Agent included a bundled uninstall script (qagent_uninstall.sh), specific to Mac and Linux supported versions that invoked multiple system commands without using absolute paths and without sanitizing the $PATH environment. If the uninstall script is executed with elevated privileges (e.g., via sudo) in an environment where $PATH has been manipulated, an attacker with root/sudo privileges could cause malicious executables to be run in place of the intended system binaries. This behavior can be leveraged for local privilege escalation and arbitrary command execution under elevated privileges.

Possible XXE vulnerability in Jenkins Plugin for Qualys Web Application Security

Qualys Jenkins Plugin for WAS prior to version and including 2.0.11 was identified to be affected by a security flaw, which was missing a permission check while performing a connectivity check to Qualys Cloud Services. This allowed any user with login access to configure or edit jobs to utilize the plugin and configure potential a rouge endpoint via which it was possible to control response for certain request which could be injected with XXE payloads leading to XXE while processing the response data

Possible XSS vulnerability in Jenkins Plugin for Qualys Policy Compliance

Qualys Jenkins Plugin for Policy Compliance prior to version and including 1.0.5 was identified to be affected by a security flaw, which was missing a permission check while performing a connectivity check to Qualys Cloud Services. This allowed any user with login access and access to configure or edit jobs to utilize the plugin to configure a potential rouge endpoint via which it was possible to control response for certain request which could be injected with XSS payloads leading to XSS while processing the response data

NTFS Junction

An NTFS Junction condition exists in the Qualys Cloud Agent for Windows platform in versions before 4.8.0.31. Attackers may write files to arbitrary locations via a local attack vector. This allows attackers to assume the privileges of the process, and they may delete or otherwise on unauthorized files, allowing for the potential modification or deletion of sensitive files limited only to that specific directory/file object. This vulnerability is bounded to the time of installation/uninstallation and can only be exploited locally. At the time of this disclosure, versions before 4.0 are classified as End of Life.

Race Condition

A Race Condition exists in the Qualys Cloud Agent for Windows platform in versions from 3.1.3.34 and before 4.5.3.1. This allows attackers to escalate privileges limited on the local machine during uninstallation of the Qualys Cloud Agent for Windows. Attackers may gain SYSTEM level privileges on that asset to run arbitrary commands. At the time of this disclosure, versions before 4.0 are classified as End of Life.

Executable Hijacking

An Executable Hijacking condition exists in the Qualys Cloud Agent for Windows platform in versions before 4.5.3.1. Attackers may load a malicious copy of a Dependency Link Library (DLL) via a local attack vector instead of the DLL that the application was expecting, when processes are running with escalated privileges. This vulnerability is bounded only to the time of uninstallation and can only be exploited locally. At the time of this disclosure, versions before 4.0 are classified as End of Life.

Possible XXE vulnerability in Jenkins Plugin for Qualys Policy Compliance

Qualys Jenkins Plugin for Policy Compliance prior to version and including 1.0.5 was identified to be affected by a security flaw, which was missing a permission check while performing a connectivity check to Qualys Cloud Services. This allowed any user with login access to configure or edit jobs to utilize the plugin and configure potential a rouge endpoint via which it was possible to control response for certain request which could be injected with XXE payloads leading to XXE while processing the response data

Local Privilege Escalation

Qualys Cloud Agent for macOS (versions 2.5.1-75 before 3.7) installer allows a local escalation of privilege bounded only to the time of installation and only on older macOSX (macOS 10.15 and older) versions. Attackers may exploit incorrect file permissions to give them ROOT command execution privileges on the host. During the install of the PKG, a step in the process involves extracting the package and copying files to several directories. Attackers may gain writable access to files during the install of PKG when extraction of the package and copying files to several directories, enabling a local escalation of privilege.

Stored XSS Vulnerability in QualysGuard VM/PC

A Qualys web application was found to have a stored XSS vulnerability resulting from the absence of HTML encoding in the presentation of logging information to users. This vulnerability allowed a user with login access to the application to introduce XSS payload via browser details. 

Incorrect Permission Assignment on Qualys Container Scanning Connector Plugin 1.6.2.6 and earlier

An incorrect permission check in Qualys Container Scanning Connector Plugin 1.6.2.6 and earlier allows attackers with global Item/Configure permission (while lacking Item/Configure permission on any particular job) to enumerate credentials IDs of credentials stored in Jenkins and to connect to an attacker-specified URL using attacker-specified credentials IDs, capturing credentials stored in Jenkins. 

An issue was discovered in Qualys Cloud Agent 4.8.0-49. It writes "ps auxwwe" output to the /var/log/qualys/qualys-cloud-agent-scan.log file. This may, for example, unexpectedly write credentials (from environment variables) to disk in cleartext. NOTE: there are no common circumstances in which qualys-cloud-agent-scan.log can be read by a user other than root; however, the file contents could be exposed through site-specific operational practices. The vendor does NOT characterize this as a vulnerability because the ps data collection is intentional, and would only capture credentials on a machine that was already affected by the CWE-214 weakness

An issue was discovered in Qualys Cloud Agent 4.8.0-49. It executes programs at various full pathnames without first making ownership and permission checks (e.g., to help ensure that a program was installed by root) and without integrity checks (e.g., a checksum comparison against known legitimate programs). Also, the vendor recommendation is to install this agent software with root privileges. Thus, privilege escalation is possible on systems where any of these pathnames is controlled by a non-root user. An example is /opt/firebird/bin/isql, where the /opt/firebird directory is often owned by the firebird user.