CVE-2019-19739 in YetiShare
Summary
by MITRE
MFScripts YetiShare 3.5.2 through 4.5.3 does not set the Secure flag on session cookies, allowing the cookie to be sent over cleartext channels.
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Analysis
by VulDB Data Team • 03/18/2024
The vulnerability identified as CVE-2019-19739 affects MFScripts YetiShare versions 3.5.2 through 4.5.3, representing a critical security flaw in session management implementation. This issue stems from the application's failure to properly configure session cookies with the Secure flag, which is a fundamental security mechanism designed to protect sensitive authentication data. The Secure flag ensures that cookies are only transmitted over encrypted connections using https protocol, preventing interception attacks on unencrypted channels. Without this flag, session identifiers become vulnerable to man-in-the-middle attacks and eavesdropping attempts.
The technical flaw manifests in the application's cookie configuration where session management does not enforce secure transmission requirements. This misconfiguration allows attackers to capture session cookies through network sniffing on unencrypted connections, potentially enabling session hijacking attacks. The vulnerability directly relates to CWE-614, which specifically addresses insecure cookies that are transmitted over unencrypted channels. Attackers can exploit this weakness by intercepting network traffic on public wifi networks, compromised routers, or during transmission across unsecured http connections. The impact extends beyond simple data interception as compromised session cookies can grant unauthorized access to user accounts and sensitive system resources.
The operational impact of this vulnerability is significant for organizations using affected YetiShare versions, as it creates multiple attack vectors for credential theft and unauthorized access. When session cookies lack the Secure flag, attackers can leverage various techniques including packet sniffing, network monitoring tools, and proxy-based attacks to capture authentication tokens. This vulnerability particularly affects environments where http traffic is not properly redirected to https, or where users access the application through unencrypted connections. The attack surface expands to include any network path where traffic is not encrypted, making this a widespread concern for organizations with distributed user bases or those operating in environments where secure connections cannot be guaranteed.
Organizations should implement immediate mitigations including enforcing mandatory https redirects for all application traffic and ensuring proper cookie configuration with the Secure flag. The recommended approach involves updating to patched versions of YetiShare or implementing network-level controls to enforce secure connections. Security teams should also conduct comprehensive network audits to identify and remediate any unencrypted traffic pathways. Additionally, implementing proper cookie security policies that include SameSite attributes along with Secure and HttpOnly flags will provide enhanced protection against cross-site scripting and session hijacking attacks. This vulnerability aligns with ATT&CK technique T1566 which covers credential access through phishing and network sniffing attacks, emphasizing the importance of proper session management in preventing unauthorized access to sensitive systems.