A remote buffer overflow vulnerability affects Microsoft Office XP. The problem presents itself when an unsuspecting user follows a malicious HTML link that points to a Office document. A boundary condition error is exposed during this operation that may allow attacker-specified data to corrupt process memory. An attacker may leverage this issue to execute arbitrary code with the privileges of an unsuspecting user that follows a malicious embedded link.
Refusing to open Office documents originating from potentially malicious sources will greatly reduce exposure to this issue.
As exploitation of this issue requires an unsuspecting user to follow a malicious link, it is advised that users exercise extreme caution when following links provided by individuals or groups of questionable legitimacy.
Non-administrative software should always be run as an unprivileged user with minimal access rights to reduce the impact of latent vulnerabilities.
Microsoft has released updates to address this issue.