Multiple vulnerabilities have been discovered in eSignal, which can be exploited by malicious people to compromise a user's system.
1) A boundary error in WinSig.exe when processing QUOTE files (".quo") can be exploited to cause a stack-based buffer overflow.
2) A boundary error in WinSig.exe when processing the "<FaceName>" tag can be exploited to cause a heap-based buffer overflow via a specially crafted Time and Sales file (".ets").
3) The application loads libraries (e.g. JRS_UT.dll) in an insecure manner and can be exploited to load arbitrary libraries by tricking a user into e.g. opening a QUOTE file (".quo") located on a remote WebDAV or SMB share.
Successful exploitation of these vulnerabilities allows execution of arbitrary code.
The vulnerabilities are confirmed in version 10.6.2425.1208. Other versions may also be affected.
Solution: Do not open files from untrusted sources.
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Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this
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Subject: eSignal Buffer Overflow and Insecure Library Loading Vulnerabilities
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