Adobe Reader and Acrobat CoolType.dll SING Table Parsing Stack-Based Buffer Overflow (CVE-2010-2883)

1. Vulnerability Overview & Root Cause

This vulnerability (CVE-2010-2883) is a critical stack-based buffer overflow (CWE-787) located within the CoolType.dll library, which is responsible for font rendering in Adobe Reader and Acrobat. The root cause lies in the improper boundary validation when parsing the Smart INdependent Glyphlets (SING) table structure inside TrueType Fonts (TTF). Specifically, the application copies a string from a long field (such as uniqueName) into a fixed-size stack buffer using an unsafe string copy operation, leading to a buffer overflow.

2. Exploitation Mechanics & Attack Scenario

An attacker exploits this vulnerability by embedding a specially crafted TTF font containing an oversized SING table field into a PDF document. When a victim opens the malicious PDF, the CoolType.dll parser processes the font and overflows the stack, overwriting the return address. In-the-wild exploits historically bypassed DEP and ASLR by leveraging Return-Oriented Programming (ROP) chains constructed from non-ASLR modules like icucnv36.dll to execute arbitrary shellcode.

3. Infrastructure & Business Impact

As a highly exploited vulnerability listed in CISA's KEV catalog with an EPSS score of 0.8138, this flaw represents a severe threat to enterprise endpoints. Successful exploitation allows remote attackers to gain the execution context of the logged-in user, potentially leading to full system compromise, lateral movement, and unauthorized access to sensitive corporate data.