CVE-2017-8367 in Easy Converter
Summary
by MITRE
Buffer overflow in Ether Software Easy MOV Converter 1.4.24, Easy DVD Creator, Easy MPEG/AVI/DIVX/WMV/RM to DVD, Easy Avi/Divx/Xvid to DVD Burner, Easy MPEG to DVD Burner, Easy WMV/ASF/ASX to DVD Burner, Easy RM RMVB to DVD Burner, Easy CD DVD Copy, MP3/AVI/MPEG/WMV/RM to Audio CD Burner, MP3/WAV/OGG/WMA/AC3 to CD Burner, MP3 WAV to CD Burner, My Video Converter, Easy AVI DivX Converter, Easy Video to iPod Converter, Easy Video to PSP Converter, Easy Video to 3GP Converter, Easy Video to MP4 Converter, and Easy Video to iPod/MP4/PSP/3GP Converter allows local attackers to cause a denial of service (SEH overwrite) or possibly have unspecified other impact via a long username.
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Analysis
by VulDB Data Team • 09/22/2020
The vulnerability identified as CVE-2017-8367 represents a critical buffer overflow flaw affecting multiple Ether Software conversion and burning applications. This issue manifests in versions including Easy MOV Converter 1.4.24 and various DVD creation tools, video conversion utilities, and audio CD burning applications. The flaw specifically occurs when the software processes user input, particularly username data, without proper bounds checking mechanisms. The vulnerability falls under CWE-121, which categorizes buffer overflow conditions where insufficient space allocation leads to memory corruption. Attackers can exploit this weakness by providing an excessively long username string that exceeds the allocated buffer space, triggering memory corruption during program execution.
The technical implementation of this vulnerability involves the exploitation of structured exception handling (SEH) mechanisms within the Windows operating system. When the malformed username input exceeds buffer boundaries, it overwrites the structured exception handler chain, leading to unpredictable program behavior. This SEH overwrite technique allows attackers to redirect program execution flow, potentially enabling code execution or complete system compromise. The vulnerability's impact extends beyond simple denial of service as indicated in the description, with the potential for unspecified other impacts that could include remote code execution or privilege escalation. The attack vector requires local system access, making it a local privilege escalation vulnerability that can be particularly dangerous when combined with other exploitation techniques.
The operational impact of CVE-2017-8367 affects organizations and individual users who rely on these multimedia conversion tools for routine tasks. The vulnerability creates a persistent security risk since the affected software packages are commonly used for both personal and business multimedia processing activities. Attackers exploiting this weakness can cause system instability through denial of service conditions, potentially rendering the affected applications unusable or triggering system crashes. More critically, the SEH overwrite capability provides a pathway for attackers to execute arbitrary code with the privileges of the affected user. This vulnerability aligns with ATT&CK technique T1059 for command and scripting interpreter and T1068 for exploit for privilege escalation, making it particularly concerning for enterprise environments where these tools might be deployed across multiple systems.
Mitigation strategies for CVE-2017-8367 should focus on immediate software updates and patches from Ether Software, as the vendor would have addressed the buffer overflow conditions in subsequent releases. System administrators should implement application whitelisting policies to restrict execution of untrusted multimedia conversion tools, particularly those from unknown sources. Network segmentation and privilege separation practices can limit the potential impact if an attacker successfully exploits this vulnerability. Regular security assessments should include scanning for outdated multimedia software packages that may contain similar buffer overflow vulnerabilities. The vulnerability demonstrates the importance of input validation and bounds checking in software development, aligning with secure coding practices recommended in OWASP Top Ten and NIST Cybersecurity Framework guidelines. Organizations should also consider implementing intrusion detection systems to monitor for exploitation attempts targeting known buffer overflow vulnerabilities in multimedia applications.