CVE-2025-2691 in nossrf
Summary
by MITRE • 03/23/2025
Versions of the package nossrf before 1.0.4 are vulnerable to Server-Side Request Forgery (SSRF) where an attacker can provide a hostname that resolves to a local or reserved IP address space and bypass the SSRF protection mechanism.
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Analysis
by VulDB Data Team • 03/27/2025
The vulnerability identified as CVE-2025-2691 affects the nossrf package versions prior to 1.0.4 and represents a critical server-side request forgery flaw that enables attackers to circumvent security protections designed to prevent unauthorized access to internal network resources. This vulnerability operates by exploiting the package's insufficient validation mechanisms for hostname inputs, allowing malicious actors to manipulate the system into making requests to local or reserved IP address ranges that should normally be blocked. The flaw stems from inadequate network boundary checking and hostname resolution validation that fails to properly sanitize or restrict input parameters before they are processed.
The technical implementation of this vulnerability leverages the fundamental weakness in how the nossrf package handles network requests and hostname resolution. When an attacker provides a hostname that resolves to an internal or reserved IP address space such as 127.0.0.1, 10.0.0.0/8, 172.16.0.0/12, or 192.168.0.0/16 ranges, the package's SSRF protection mechanisms fail to properly intercept or block these requests. This occurs because the validation logic does not sufficiently verify the resolved IP addresses against known internal network ranges or implement proper network boundary checks. The vulnerability aligns with CWE-918, which specifically addresses server-side request forgery vulnerabilities where applications fail to properly validate and restrict access to internal resources.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can enable attackers to perform reconnaissance on internal network services, access sensitive data stored on internal servers, or potentially exploit other vulnerabilities within the internal network. Attackers can leverage this flaw to probe internal systems, access administrative interfaces, or gather intelligence about internal network topology and services. The vulnerability is particularly concerning because it undermines the fundamental security principle of network isolation and can lead to privilege escalation or lateral movement within compromised environments. This type of vulnerability is categorized under the ATT&CK framework as part of the T1190 technique for exploiting vulnerabilities in software applications.
Organizations utilizing the nossrf package in versions prior to 1.0.4 should immediately implement mitigations to address this vulnerability. The primary recommendation involves upgrading to version 1.0.4 or later, which contains the necessary fixes for proper hostname validation and IP address range filtering. Additionally, implementing network segmentation, firewall rules, and proper input sanitization can provide additional layers of protection. The vulnerability demonstrates the importance of robust input validation and proper network boundary enforcement in security-critical applications. Security teams should also consider implementing monitoring and logging for unusual network requests to detect potential exploitation attempts. The remediation process should include thorough testing of the updated package to ensure that legitimate functionality remains intact while addressing the security flaw. This vulnerability highlights the critical need for continuous security assessment and the implementation of defense-in-depth strategies to protect against sophisticated attack vectors that target application-level security controls.