CVE-2012-6129 in Transmission
Summary
by MITRE
Stack-based buffer overflow in utp.cpp in libutp, as used in Transmission before 2.74 and possibly other products, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via crafted "micro transport protocol packets."
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Analysis
by VulDB Data Team • 12/29/2024
The vulnerability identified as CVE-2012-6129 represents a critical stack-based buffer overflow flaw within the libutp library, specifically in the utp.cpp file. This library serves as a core component in the Transmission BitTorrent client, where it handles micro transport protocol packets for efficient peer-to-peer communication. The flaw arises from insufficient input validation and bounds checking when processing malformed micro transport protocol packets, creating a condition where attackers can manipulate packet structures to overwrite adjacent memory locations on the stack. This vulnerability affects Transmission versions prior to 2.74 and potentially other software products that utilize the libutp library, making it a widespread concern across various applications relying on this networking component.
The technical implementation of this buffer overflow stems from improper handling of packet data structures within the micro transport protocol implementation. When the utp.cpp module processes incoming packets, it fails to validate the size and structure of incoming data before copying it into fixed-size stack buffers. This allows an attacker to craft specially designed packets that exceed the allocated buffer boundaries, causing stack corruption that can lead to unpredictable program behavior. The vulnerability operates at the protocol level where the attacker sends malformed packets that trigger the overflow during normal packet processing operations, making it particularly dangerous as it can be exploited through standard network communication without requiring special privileges or user interaction.
The operational impact of this vulnerability extends beyond simple denial of service to potentially enabling remote code execution, making it a severe security concern for any system running affected versions of Transmission or other software utilizing libutp. The crash conditions resulting from the buffer overflow can cause complete application termination, leading to service disruption for users and potential denial of service attacks against peer-to-peer networks. More critically, the stack corruption can be leveraged by attackers to overwrite return addresses and function pointers, potentially allowing arbitrary code execution with the privileges of the affected application. This makes the vulnerability particularly attractive to threat actors seeking to compromise systems through peer-to-peer networks where Transmission is commonly deployed, such as in enterprise environments or personal computing systems.
Mitigation strategies for CVE-2012-6129 primarily focus on immediate version updates to Transmission 2.74 or later, which include patched implementations of the libutp library with proper input validation and bounds checking. Organizations should also implement network-level protections such as packet filtering and intrusion detection systems to monitor for malformed micro transport protocol packets that could indicate exploitation attempts. The vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which specifically addresses buffer overflows occurring in stack memory regions where insufficient bounds checking allows data to overflow into adjacent memory locations. From an attack framework perspective, this vulnerability maps to ATT&CK technique T1059.007 for command and control through peer-to-peer networks, and T1499.004 for network denial of service attacks. Additionally, system administrators should conduct thorough vulnerability assessments to identify other products that may be using the vulnerable libutp library, as the flaw's impact extends beyond Transmission to any software that incorporates this networking component.