CVE-2013-0778 in Firefox
Summary
by MITRE
The ClusterIterator::NextCluster function in Mozilla Firefox before 19.0, Thunderbird before 17.0.3, and SeaMonkey before 2.16 allows remote attackers to execute arbitrary code or cause a denial of service (out-of-bounds read) via unspecified vectors.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 05/05/2021
The vulnerability identified as CVE-2013-0778 represents a critical out-of-bounds read flaw within the ClusterIterator::NextCluster function of Mozilla's browser and email client software. This issue affects Firefox versions prior to 19.0, Thunderbird versions prior to 17.0.3, and SeaMonkey versions prior to 2.16, indicating a widespread impact across Mozilla's product ecosystem. The vulnerability stems from inadequate bounds checking in the cluster iteration logic, which processes data structures that manage memory clusters in the application's rendering and parsing mechanisms. Such flaws typically arise when software fails to properly validate array indices or memory access boundaries before performing operations on potentially untrusted data.
The technical exploitation of this vulnerability occurs through unspecified vectors that likely involve crafted content or data streams that trigger the flawed cluster iteration logic. When the ClusterIterator::NextCluster function processes malformed input, it attempts to read memory locations beyond the allocated bounds of the intended data structure. This out-of-bounds read can result in information disclosure, application instability, or more severely arbitrary code execution depending on the specific memory corruption patterns. The vulnerability's classification aligns with CWE-129, which covers insufficient validation of length of buffers, and represents a classic example of memory safety issues that have plagued web browsers and applications for decades. Attackers can leverage this flaw by constructing malicious web content or email messages that, when processed by the affected applications, trigger the vulnerable code path and potentially lead to full system compromise.
The operational impact of CVE-2013-0778 extends beyond simple denial of service scenarios to encompass potential remote code execution capabilities that could enable attackers to gain complete control over affected systems. This makes the vulnerability particularly dangerous in enterprise environments where users may encounter malicious content through web browsing or email interactions. The flaw's presence in core browser components means that successful exploitation could allow attackers to bypass security boundaries, execute arbitrary code with the privileges of the affected application, and potentially escalate to system-level access. Additionally, the vulnerability's exploitation could lead to information disclosure attacks where sensitive memory contents are read and exfiltrated, potentially including credentials, personal data, or other confidential information. The ATT&CK framework categorizes this type of vulnerability under privilege escalation and code execution techniques, as it provides an entry point for attackers to establish persistent access and conduct further reconnaissance.
Mitigation strategies for CVE-2013-0778 primarily focus on immediate software updates and patches provided by Mozilla to address the specific bounds checking deficiencies in the ClusterIterator::NextCluster function. Organizations should prioritize updating all affected Mozilla products to their patched versions, as these updates contain proper memory validation and bounds checking mechanisms. Network administrators should implement additional protective measures such as web application firewalls, content filtering systems, and email security solutions that can detect and block malicious content targeting this vulnerability. Security monitoring should include detection of exploitation attempts through unusual memory access patterns or application crashes that may indicate exploitation of out-of-bounds read conditions. System hardening practices including sandboxing, address space layout randomization, and stack canaries should be implemented to reduce the effectiveness of potential exploitation attempts. The vulnerability also underscores the importance of regular security assessments and vulnerability management processes to identify and remediate similar memory safety issues in other software components that may be susceptible to similar attack vectors.