{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/msquic/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Microsoft QUIC"],"_cs_severities":["critical"],"_cs_tags":["msquic","privilege-escalation","windows"],"_cs_type":"advisory","_cs_vendors":["Microsoft"],"content_html":"\u003cp\u003eMicrosoft QUIC, a general-purpose transport protocol, is vulnerable to a critical elevation of privilege vulnerability identified as CVE-2026-32179. This vulnerability stems from improper input validation within the MsQuic component when decoding ACK frames, specifically an integer underflow. Exploitation of this vulnerability allows a remote attacker to gain elevated privileges on the target system. The affected packages include nuget/Microsoft.Native.Quic.MsQuic.OpenSSL and nuget/Microsoft.Native.Quic.MsQuic.Schannel, specifically versions before 2.4.18 and versions between 2.5.0-ci.532574 and 2.5.7. Defenders should prioritize patching vulnerable systems to mitigate the risk of exploitation.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker establishes a QUIC connection to a vulnerable server running a Microsoft QUIC implementation.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious QUIC ACK frame with a specific sequence number designed to trigger an integer underflow during decoding.\u003c/li\u003e\n\u003cli\u003eThe vulnerable MsQuic library attempts to parse the crafted ACK frame, leading to an integer underflow during sequence number processing.\u003c/li\u003e\n\u003cli\u003eThe integer underflow corrupts internal data structures used for managing QUIC connections and stream state.\u003c/li\u003e\n\u003cli\u003eThe memory corruption allows the attacker to overwrite critical security-related data, such as access control lists (ACLs) or privilege levels.\u003c/li\u003e\n\u003cli\u003eThe attacker triggers the execution of a function or code path that relies on the corrupted security data.\u003c/li\u003e\n\u003cli\u003eDue to the corrupted security data, the attacker gains elevated privileges within the context of the MsQuic process.\u003c/li\u003e\n\u003cli\u003eThe attacker leverages the elevated privileges to perform unauthorized actions, such as accessing sensitive data or executing arbitrary code on the system.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-32179 allows an attacker to elevate their privileges on the target system. This can lead to complete system compromise, including unauthorized data access, modification, and deletion. The vulnerability affects systems running vulnerable versions of Microsoft QUIC, potentially impacting a wide range of services and applications that rely on the protocol. The observed damage would be unauthorized privilege escalation leading to a complete compromise of the target machine.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply the Microsoft patch for CVE-2026-32179 to affected systems running Microsoft QUIC.\u003c/li\u003e\n\u003cli\u003eMonitor network traffic for malformed QUIC ACK frames indicative of exploitation attempts using a network intrusion detection system (NIDS).\u003c/li\u003e\n\u003cli\u003eEnable process creation logging and monitor for unexpected processes running with elevated privileges after a QUIC connection is established. This can aid in detecting post-exploitation activity.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-03T12:00:00Z","date_published":"2024-01-03T12:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-01-03-msquic-privesc/","summary":"CVE-2026-32179 is a critical remote elevation of privilege vulnerability in Microsoft QUIC caused by improper input validation during ACK frame decoding, potentially allowing an attacker to gain elevated privileges over the network.","title":"Microsoft QUIC Remote Elevation of Privilege Vulnerability (CVE-2026-32179)","url":"https://feed.craftedsignal.io/briefs/2024-01-03-msquic-privesc/"}],"language":"en","title":"CraftedSignal Threat Feed - Msquic","version":"https://jsonfeed.org/version/1.1"}