CVE-2012-0242

published 2012-02-21

CVE-2012-0242: Format string vulnerability in Advantech/BroadWin WebAccess before 7.0 allows remote attackers to execute arbitrary code via format string specifiers in a…

Priority P2 64 critical 10 CVSS 2.0

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

EXPLOIT

Format string vulnerability in Advantech/BroadWin WebAccess before 7.0 allows remote attackers to execute arbitrary code via format string specifiers in a message string.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
advantech	advantech_webaccess	<= 6.0	—
advantech	advantech_webaccess	—	—

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

url http://aluigi.org/poc/bwocxrun_1.zip↗

url https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/17772.zip↗

filename bwocxrun.ocx↗

• → Monitor for exploitation of the OcxSpool function via format string specifiers passed through the Msg string argument — the vulnerable code path calls vsprintf() without a format argument, allowing %n/%s/%x etc. in attacker-controlled input to execute arbitrary code. ↗
• → Monitor for abuse of the WriteTextData and CloseFile functions in bwocxrun.ocx, which allow arbitrary memory corruption via a fully controllable stream identifier passed to fclose() and fwrite(). ↗
• → Detect loading or instantiation of the bwocxrun.ocx ActiveX component (version 1.0.0.10 / WebAccess before 7.0) in browser processes, which is the attack surface for remote exploitation. ↗

• · The vulnerability is in the ActiveX component bwocxrun.ocx and is exploitable remotely via a browser visiting a malicious page; exploitation requires the client to have the ActiveX control installed (Windows only). ↗
• · At time of disclosure no fix was available; detection/blocking of the ActiveX control instantiation is the primary mitigation. ↗

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