Bug 121229 (CVE-2004-0421)
| Summary: | CAN-2004-0421 libpng can access out of bounds memory | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Mark J. Cox <mjc> |
| Component: | vulnerability | Assignee: | Matthias Clasen <mclasen> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | Keywords: | Security |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2004-05-19 20:32:16 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
*** Bug 120508 has been marked as a duplicate of this bug. *** removing embargo An errata has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2004-180.html |
From: Steve G <linux_4ever> In the png_format_buffer function located in pngerror.c around line 133 is the following code: if (message == NULL) buffer[iout] = 0; else { buffer[iout++] = ':'; buffer[iout++] = ' '; png_memcpy(buffer+iout, message, 64); buffer[iout+63] = 0; } This code is called from the png_chunk_error & png_chunk_warning functions. An example of their use would be in pngutil.c around line 119. png_chunk_error(png_ptr, "CRC error"); In the above code, the message being constructed is only 10 characters long. The png_memcpy function will unconditionally access 54 bytes beyond the message. This could cause a carefully crafted png image to cause a denial of service. Possibly embargoed; marking as embargoed until communicated otherwise.