CyberRota Analysis
AI-GeneratedThe vulnerability exists in the GnuTLS TLS backend of PJSIP, specifically in the handling of the Subject Alternative Name extension during TLS handshakes, which can lead to a stack buffer overflow. This flaw allows a network-positioned attacker to exploit the vulnerability by presenting a crafted certificate, potentially resulting in application crashes or control flow hijacking. Organizations using PJSIP with GnuTLS should prioritize patching this issue to mitigate the risk of exploitation.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
PJSIP is a free and open source multimedia communication library written in C. Prior to commit c4a151a, a stack buffer overflow exists in the GnuTLS TLS backend when parsing the Subject Alternative Name extension of a peer certificate (tls_cert_get_info() in ssl_sock_gtls.c). Only GnuTLS builds are affected (--with-gnutls); OpenSSL and Apple SecureTransport/Network.framework builds are not affected. While extracting certificate information after a TLS handshake, an incorrect buffer-size value can cause an oversized SubjectAltName entry to be written past the end of a fixed-size stack buffer. A network-positioned attacker presenting a crafted certificate — a malicious server to a connecting client, or a malicious client to a server that requests certificates — can trigger this during the TLS handshake, before any SIP-level authentication. Impact may range from unexpected application termination to control flow hijack/memory corruption. This issue has been patched via commit c4a151a.
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