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Sid 1-47165

Message

FILE-PDF Adobe Acrobat Pro HTML image input element use-after-free attempt

Summary

This event is generated when a crafted HTML file designed to exploit Adobe Acrobat Pro traverses the network.

Impact

Attempted User Privilege Gain

Detailed information

This vulnerability is due to a dangling pointer that leads to a use after free vulnerability in in HTML processing / conversion engine when handing image definition elements. Specifically, the vulnerability is triggered by a crafted image input element within HTML file which leads to a temporal safety violation if it is possible to perform read / write dereferences on the dangling pointer. This instance causes access violation exception because of the computation within the HTML conversion engine that dereferences the dangling pointer. A constraint for exploitation of this vulnerability is that the memory area of the freed (i.e., old) object is reused by another object. The mismatch between the old and the new object can provide attacker with an unintended memory access -- potentially leading to code corruption or control-flow hijack attack. Successful exploitation could lead to arbitrary code execution.

Affected systems

  • Acrobat Pro (v. 2018.011.20040) on Windows 7 (x86)

Ease of attack

False positives

None known.

False negatives

None known.

Corrective action

Please follow corporate patch and update procedures.

Contributors

  • Cisco's Talos Intelligence Group

Additional References

  • helpx.adobe.com/security/products/acrobat/APSB18-21.html