CVE-2008-3187 in zypper
Summary
by MITRE
zypp-refresh-patches in zypper in SUSE openSUSE 10.2, 10.3, and 11.0 does not ask the user before accepting repository keys, which allows remote repositories to cause a denial of service (package data corruption) via a spoofed key.
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Analysis
by VulDB Data Team • 02/03/2025
The vulnerability identified as CVE-2008-3187 resides within the zypper package management system of SUSE openSUSE versions 10.2, 10.3, and 11.0, specifically affecting the zypp-refresh-patches component. This flaw represents a critical security oversight in the package repository key management process, where the system fails to properly validate or confirm user consent before automatically accepting cryptographic keys from remote repositories. The vulnerability stems from a design weakness in the software update mechanism that prioritizes automation over user verification, creating an attack surface where malicious actors can exploit the lack of proper key validation procedures.
The technical implementation of this vulnerability allows attackers to craft malicious repository configurations that contain spoofed GPG keys designed to appear legitimate to the automated verification system. When zypp-refresh-patches processes these repositories, it automatically accepts and installs the spoofed keys without prompting the user for confirmation or explicit approval. This behavior directly violates security best practices for cryptographic key management and creates a pathway for remote code execution or system compromise through package integrity attacks. The flaw operates at the level of package repository trust management and represents a failure in the principle of least privilege, where automated systems should never implicitly trust external cryptographic materials without explicit user consent.
The operational impact of this vulnerability extends beyond simple denial of service to encompass potential system compromise and data integrity breaches. When a spoofed repository key is accepted, it can lead to package data corruption as malicious packages may be signed with the compromised key and subsequently installed without user awareness. This creates a persistent threat vector where attackers can maintain access to systems through compromised package repositories while potentially obscuring their activities through legitimate-looking software updates. The vulnerability affects the entire package management ecosystem of affected SUSE distributions and represents a significant weakness in the supply chain security model, as it allows remote attackers to manipulate the trust relationships between systems and package repositories.
This vulnerability maps directly to CWE-295 which addresses "Improper Certificate Validation" and aligns with ATT&CK technique T1195.002 related to "Phishing for Information" and T1068 which covers "Exploitation for Privilege Escalation." The attack surface is particularly concerning as it enables attackers to establish persistent access through package management systems, which are critical infrastructure components. Organizations using affected SUSE versions face potential compromise through supply chain attacks where attackers can manipulate package repositories to deliver malicious payloads. The lack of user confirmation requirements creates an implicit trust model that can be easily subverted, making this vulnerability particularly dangerous in enterprise environments where package management systems are extensively used.
Mitigation strategies should focus on immediate patching of affected SUSE distributions to versions that implement proper key validation procedures with explicit user consent prompts. System administrators should also implement repository verification processes that manually validate repository keys before allowing automatic acceptance. Network segmentation and monitoring of package management activities can help detect suspicious repository additions or key changes. Additionally, organizations should establish strict policies for repository management and regularly audit package repositories to ensure they contain only trusted sources. The fundamental fix requires implementing proper user interaction requirements for cryptographic key acceptance, ensuring that automated systems never implicitly trust external materials without explicit user authorization, thereby restoring the security controls necessary to maintain package integrity and system trust.