CVE-2008-2040 in Peercast
Summary
by MITRE
Stack-based buffer overflow in the HTTP::getAuthUserPass function (core/common/http.cpp) in Peercast 0.1218 and gnome-peercast allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a Basic Authentication string with a long (1) username or (2) password.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 12/24/2024
The vulnerability identified as CVE-2008-2040 represents a critical stack-based buffer overflow in the Peercast media streaming software ecosystem. This flaw exists within the HTTP::getAuthUserPass function located in the core/common/http.cpp file of Peercast version 0.1218 and its associated gnome-peercast component. The vulnerability specifically targets the handling of Basic Authentication strings during HTTP communication, creating a dangerous condition where remote attackers can manipulate the authentication process to trigger system instability.
The technical nature of this vulnerability stems from improper input validation within the authentication parsing mechanism. When the HTTP::getAuthUserPass function processes incoming Basic Authentication headers, it fails to adequately check the length of either the username or password components within the authentication string. This oversight allows attackers to craft malicious authentication strings containing excessively long username or password values that exceed the allocated buffer space on the stack. The buffer overflow occurs because the implementation does not perform bounds checking before copying authentication data into fixed-size stack buffers, directly violating fundamental security principles of input sanitization and memory management.
The operational impact of this vulnerability extends beyond simple denial of service conditions to potentially enable remote code execution. When attackers exploit this buffer overflow, they can cause the Peercast application to crash and terminate unexpectedly, resulting in a denial of service that disrupts media streaming services. However, the more concerning aspect is that the stack-based nature of the overflow could potentially allow attackers to overwrite critical stack memory locations, including return addresses and function pointers, thereby enabling arbitrary code execution on the target system. This capability transforms a simple service disruption into a serious security compromise that could allow attackers to gain unauthorized control over affected systems.
From a cybersecurity perspective, this vulnerability maps directly to CWE-121 Stack-based Buffer Overflow, which specifically addresses buffer overflows occurring in stack memory regions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The attack vector aligns with ATT&CK technique T1203, which describes the exploitation of software vulnerabilities to gain remote code execution capabilities. The vulnerability affects both the core Peercast application and its graphical gnome-peercast interface, indicating a fundamental flaw in the authentication handling code that impacts multiple components of the software stack.
Mitigation strategies for this vulnerability should prioritize immediate patching of affected Peercast installations to version 0.1219 or later, which contains the necessary fixes for the buffer overflow conditions. System administrators should also implement network-level controls to restrict access to Peercast services and monitor for suspicious authentication attempts that might indicate exploitation attempts. Additionally, deploying intrusion detection systems capable of identifying malformed Basic Authentication strings and implementing proper input validation at the application level can help prevent exploitation attempts. Organizations should also consider implementing application whitelisting policies to restrict execution of untrusted Peercast binaries and ensure that all authentication handling code includes proper bounds checking mechanisms to prevent similar vulnerabilities from occurring in the future.