SEH Buffer Overflows in Allok Media Converters Enable Local Code Execution
Three AllokSoft multimedia applications were assigned CVEs for buffer overflow flaws in their License Name registration field that can lead to arbitrary code execution. The affected products are Allok soft WMV to AVI MPEG DVD WMV Converter 4.6.1217 (CVE-2018-25314), Allok AVI to DVD SVCD VCD Converter 4.0.1217 (CVE-2018-25302), and Allok Video to DVD Burner 2.6.1217 (CVE-2018-25303). The vulnerabilities were classified under CWE-120 and CWE-121, with CVSS v3.1 and v4.0 vectors added to the records.
The published descriptions say a local attacker can trigger the flaws by supplying an oversized string in the registration dialog, causing a structured exception handler (SEH) overwrite and execution of embedded shellcode with the application's privileges. One advisory describes exploitation after clicking the Register button, while another notes a payload with junk data, SEH chain pointers, and shellcode pasted into the field. References attached to the CVE records include Exploit-DB, AllokSoft, and VulnCheck advisories, indicating publicly documented exploit details for the affected legacy software.
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How this story unfolded
3 events from the most recent confirmed update back to the earliest known activity.
Allok WMV to AVI MPEG DVD WMV Converter overflow documented as CVE-2018-25314
A CVE record was received describing a local buffer overflow in the License Name field of Allok soft WMV to AVI MPEG DVD WMV Converter 4.6.1217. According to the entry, an oversized string can trigger an SEH overwrite and enable arbitrary code execution with the application's privileges.
Allok Video to DVD Burner overflow documented as CVE-2018-25303
A CVE entry was received for a stack-based buffer overflow in the License Name field of Allok Video to DVD Burner 2.6.1217. The description states that a crafted input can overwrite the SEH chain and execute attacker-supplied shellcode locally.
Allok AVI to DVD SVCD VCD Converter SEH overflow documented as CVE-2018-25302
A CVE record was received documenting a local buffer overflow in the License Name field of Allok AVI to DVD SVCD VCD Converter 4.0.1217. The flaw can be exploited via an SEH overwrite to achieve arbitrary code execution when the Register button is clicked.
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CVE-2018-25314 - Allok soft WMV to AVI MPEG DVD WMV Converter 4.6.1217 Buffer Overflow
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Open sourceCVE-2018-25302 - Allok AVI to DVD SVCD VCD Converter 4.0.1217 Buffer Overflow SEH
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Open sourceCVE-2018-25303 - Allok Video to DVD Burner 2.6.1217 Buffer Overflow SEH
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