CVE-2011-0487 in ICQ
Summary
by MITRE
ICQ 7 does not verify the authenticity of updates, which allows man-in-the-middle attackers to execute arbitrary code via a crafted file that is fetched through an automatic-update mechanism.
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Analysis
by VulDB Data Team • 01/19/2025
The vulnerability identified as CVE-2011-0487 resides in ICQ 7, a popular instant messaging client that was widely deployed in enterprise and consumer environments during the early 2010s. This flaw represents a critical security weakness in the software update mechanism that directly impacts the integrity and authenticity of the client's upgrade process. The vulnerability stems from the application's failure to implement proper cryptographic verification of update files, creating an exploitable gap in the software's security architecture that adversaries could leverage for malicious purposes.
The technical flaw manifests through the automatic-update mechanism that ICQ 7 employs to fetch and install new versions of the application. When the client attempts to download updates from remote servers, it does not validate the digital signatures or cryptographic hashes of the downloaded files. This absence of verification means that an attacker positioned within the network traffic path between the client and update server can intercept the update process and substitute the legitimate update file with a malicious one. The attacker can craft a specially designed file that, when executed during the update process, will run arbitrary code with the privileges of the user running the ICQ application.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with a sophisticated attack vector that can be leveraged for various malicious activities. The man-in-the-middle attack scenario allows adversaries to maintain persistent access to compromised systems, as the malicious code can be designed to establish backdoors, exfiltrate data, or deploy additional malware. The vulnerability affects both enterprise networks where ICQ 7 was commonly used for business communications and individual users who relied on the application for personal messaging. Given that ICQ was widely distributed and used across multiple platforms, the potential attack surface was extensive, making this vulnerability particularly dangerous from a threat actor perspective.
The attack pattern aligns with common network-based exploitation techniques that leverage trust relationships between applications and their update servers. This vulnerability demonstrates a failure in implementing proper software integrity verification, which is a fundamental security principle that should be enforced in all update mechanisms. From a cybersecurity perspective, this flaw represents a classic example of insufficient validation of software components, a weakness that can be categorized under CWE-310, which addresses cryptographic issues related to the absence of proper authentication mechanisms. The vulnerability also maps to ATT&CK technique T1027, which involves obfuscation and code injection methods that attackers can employ to bypass security controls.
Mitigation strategies for CVE-2011-0487 should focus on immediate patching of the affected ICQ 7 application to ensure that cryptographic verification mechanisms are properly implemented. Organizations should also implement network monitoring to detect unusual update traffic patterns that might indicate man-in-the-middle attacks. Network administrators can deploy intrusion detection systems that monitor for suspicious file transfers and implement network segmentation to limit the potential impact of successful exploitation. Additionally, users should be educated about the importance of verifying update sources and avoiding untrusted networks when performing software updates. The vulnerability highlights the critical importance of implementing secure update mechanisms that incorporate digital signatures, cryptographic hashes, and certificate validation to prevent unauthorized modifications to software components. Organizations should also consider implementing application whitelisting policies to restrict execution of unsigned or unverified software updates, thereby reducing the attack surface available to threat actors targeting such vulnerabilities.