Vulnerabilidades de Microsoft

Microsoft Local Security Authority Subsystem Service Information Disclosure Vulnerability

Untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to bypass a security feature locally.

Improper neutralization of special elements used in a command ('command injection') in GitHub Copilot and Visual Studio Code allows an authorized attacker to disclose information over a network.

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

Improper removal of sensitive information before storage or transfer in Windows Recovery Environment Agent allows an unauthorized attacker to bypass a security feature with a physical attack.

Access of resource using incompatible type ('type confusion') in Windows COM allows an authorized attacker to disclose information locally.

Reliance on untrusted inputs in a security decision in Windows Boot Loader allows an authorized attacker to bypass a security feature locally.

User interface (ui) misrepresentation of critical information in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.

User interface (ui) misrepresentation of critical information in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.

SymCrypt is the core cryptographic function library currently used by Windows. From 103.5.0 to before 103.11.0, The SymCryptXmssSign function passes a 64-bit leaf count value to a helper function that accepts a 32-bit parameter. For XMSS^MT parameter sets with total tree height >= 32 (which includes standard predefined parameters), this causes silent truncation to zero, resulting in a drastically undersized scratch buffer allocation followed by a heap buffer overflow during signature computation. Exploiting this issue would require an application using SymCrypt to perform an XMSS^MT signature using an attacker-controlled parameter set. It is uncommon for applications to allow the use of attacker-controlled parameter sets for signing, since signing is a private key operation, and private keys must be trusted by definition. Additionally, XMSS(^MT) signing should only be performed in a Hardware Security Module (HSM). XMSS(^MT) signing is provided in SymCrypt only for testing purposes. This is a general rule irrespective of this CVE; XMSS(^MT) and other stateful signature schemes are only cryptographically secure when it is guaranteed that the same state cannot be reused for two different signatures, which cannot be guaranteed by software alone. For this reason, XMSS(^MT) signing is also not FIPS approved when performed outside of an HSM. Fixed in version 103.11.0.