June 14, 2005
Microsoft Internet Explorer is prone to a buffer overflow vulnerability. This issue exists in the PNG image rendering library used by the browser. Successful exploitation will result in execution of arbitrary code in the context of the currently logged in user. This issue is present in the PNG image rendering library, so it is possible that other applications that use the library are affected. This is not confirmed and Symantec is not aware of any such applications.
- Microsoft Internet Explorer 5.0.1
- Microsoft Internet Explorer 5.0.1 SP1
- Microsoft Internet Explorer 5.0.1 SP2
- Microsoft Internet Explorer 5.0.1 SP3
- Microsoft Internet Explorer 5.0.1 SP4
- Microsoft Internet Explorer 5.5
- Microsoft Internet Explorer 5.5 SP1
- Microsoft Internet Explorer 5.5 SP2
- Microsoft Internet Explorer 6.0
- Microsoft Internet Explorer 6.0 SP1
- Microsoft Internet Explorer 6.0 SP2 do not use
Do not accept or execute files from untrusted or unknown sources.
Users should avoid accepting or opening unexpected files, especially if they arrive in email from an untrusted or unfamiliar source.
Do not follow links provided by unknown or untrusted sources.
Users should be wary of visiting Web sites of questionable integrity, especially if solicited to do so by an unfamiliar or untrusted source through email or other means. This may limit exposure to many Web-based attacks.
Implement multiple redundant layers of security.
Memory protection schemes such as non-executable stack/heap configurations and randomly mapped memory segments may complicate exploitation of memory corruption vulnerabilities.
Run all software as a nonprivileged user with minimal access rights.
All non-administrative activities should be performed as an unprivileged user with minimal access rights. This will limit the impact of vulnerabilities that may be exploited through Web or email attack vectors.
Microsoft has released a cumulative update for Internet Explorer to address supported versions of the browser. Fixes for Windows 98/SE/ME can be obtained through Windows Update.
Discovery is credited to Neel Mehta of ISS X-Force.
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