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Q1What is this vulnerability? (Essence + Consequences)
π¨ **Essence**: mIRC suffers from a **Buffer Overflow** when handling `irc://` URLs. π **Consequences**: Attackers can execute **arbitrary commands** with the privileges of the mIRC process.β¦
π‘οΈ **Root Cause**: **Missing boundary checks** on buffer size. The software fails to validate the length of `irc://` URLs before processing. π₯ This allows maliciously crafted long URLs to overflow memory.
Q3Who is affected? (Versions/Components)
π₯ **Affected**: Users of **mIRC**, the popular online chat program. β οΈ Specifically, those who have installed mIRC and have the `irc://` protocol handler registered.β¦
π» **Hackers' Power**: They can execute **arbitrary instructions** on the victim's system. π― The code runs with the **same permissions** as the mIRC process, potentially compromising the entire user account.
Q5Is exploitation threshold high? (Auth/Config)
π **Exploitation Threshold**: **Low**. π€ No authentication required. The attack relies on **social engineering** (tricking the user into clicking/visiting a malicious URL). It's a remote, unauthenticated attack vector.
Q6Is there a public Exp? (PoC/Wild Exploitation)
π’ **Public Exploit**: Yes. π References exist from **NTBUGTRAQ** and **Secunia** (Advisory 9996). The mailing list archives confirm the existence of proof-of-concept or detailed exploitation methods from 2003.
Q7How to self-check? (Features/Scanning)
π **Self-Check**: Look for the presence of **mIRC** on your system. π΅οΈββοΈ Check if the `irc://` protocol is registered to mIRC.β¦
π₯ **Urgency**: **High for Legacy Systems**. π For modern environments, the risk is **Low** unless running ancient, unpatched versions. π¨ If you are still using mIRC from that era, patch or remove it **IMMEDIATELY**.