CVE-2012-1088 in Linux
Summary
by MITRE
iproute2 before 3.3.0 allows local users to overwrite arbitrary files via a symlink attack on a temporary file used by (1) configure or (2) examples/dhcp-client-script.
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Analysis
by VulDB Data Team • 01/02/2025
The vulnerability identified as CVE-2012-1088 represents a significant security flaw in the iproute2 network configuration utilities suite affecting versions prior to 3.3.0. This issue manifests as a race condition vulnerability that enables local attackers to exploit temporary file handling mechanisms within the network configuration tools. The flaw specifically impacts two key components of the iproute2 package: the configure script and the examples/dhcp-client-script utility. These components create temporary files during their execution process without proper security measures to prevent symbolic link attacks, creating an exploitable condition that can be leveraged by malicious users with local access.
The technical implementation of this vulnerability stems from improper temporary file creation practices within the iproute2 utilities. When either the configure script or the dhcp-client-script executes, they generate temporary files in predictable locations without implementing secure file creation methods. Attackers can exploit this by creating symbolic links in the expected temporary file locations before the vulnerable scripts execute. This symlink attack allows the attacker to control what files are written to during the execution process, potentially overwriting critical system files or configuration data with malicious content. The vulnerability operates at the file system level and requires local system access, making it a privilege escalation issue rather than a network-based attack vector.
The operational impact of CVE-2012-1088 extends beyond simple file overwriting capabilities, as it can potentially lead to more severe consequences within compromised systems. Local attackers who exploit this vulnerability can manipulate system configuration files, potentially gaining elevated privileges or disrupting network services that depend on proper iproute2 functionality. The attack requires minimal privileges and can be executed by any local user, making it particularly dangerous in multi-user environments where system administrators may not fully trust all local accounts. Network administrators and system operators face the risk of unauthorized modifications to routing configurations, DHCP client behaviors, and other critical network management functions that rely on these utilities. This vulnerability directly relates to CWE-377, which addresses insecure temporary file creation practices, and aligns with ATT&CK technique T1059 for executing malicious code through local system access.
The remediation strategy for this vulnerability involves upgrading to iproute2 version 3.3.0 or later, where the developers implemented proper secure temporary file handling mechanisms. Organizations should prioritize patching this vulnerability across all systems running affected versions of iproute2, particularly those with multiple local users or shared system environments. System administrators should also implement additional monitoring to detect suspicious file creation patterns or unauthorized modifications to network configuration utilities. Security teams should conduct vulnerability assessments to identify systems running older versions of iproute2 and ensure that all network management tools are updated to prevent exploitation of this class of vulnerability. The fix typically involves implementing proper file creation methods that check for existing symbolic links or use secure temporary file creation functions that prevent the race condition exploited by attackers.