CVE-2020-24659
gnutls: Heap buffer overflow in handshake with no_renegotiation alert sent
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
1Exploited in Wild
-Decision
Descriptions
An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.
Se detectó un problema en GnuTLS versiones anteriores a 3.6.15. Un servidor puede desencadenar una desreferencia del puntero NULL en un cliente TLS versión 1.3, si una alerta no_renegotiation es enviada con una sincronización no prevista y luego se produce un segundo protocolo de enlace no válido. El bloqueo ocurre en la ruta de manejo de errores de la aplicación, donde la función gnutls_deinit es llamada después de detectar un fallo en el protocolo de enlace
A flaw was found in GnuTLS, where the server can trigger the client to run into heap buffer overflow if a no_renegotiation alert is sent in an unexpected timing. This flaw allows the client to crash at the session deinitialization timing. The highest threat from this vulnerability is to system availability.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2020-08-26 CVE Reserved
- 2020-09-04 CVE Published
- 2024-08-04 CVE Updated
- 2024-08-04 First Exploit
- 2024-08-11 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
CWE
- CWE-20: Improper Input Validation
- CWE-476: NULL Pointer Dereference
- CWE-787: Out-of-bounds Write
CAPEC
References (11)
URL | Tag | Source |
---|---|---|
https://security.netapp.com/advisory/ntap-20200911-0006 | Third Party Advisory |
URL | Date | SRC |
---|---|---|
https://gitlab.com/gnutls/gnutls/-/issues/1071 | 2024-08-04 |
URL | Date | SRC |
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Affected Vendors, Products, and Versions
Vendor | Product | Version | Other | Status | ||||||
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Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
Gnu Search vendor "Gnu" | Gnutls Search vendor "Gnu" for product "Gnutls" | < 3.6.15 Search vendor "Gnu" for product "Gnutls" and version " < 3.6.15" | - |
Affected
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Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 32 Search vendor "Fedoraproject" for product "Fedora" and version "32" | - |
Affected
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Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 33 Search vendor "Fedoraproject" for product "Fedora" and version "33" | - |
Affected
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Opensuse Search vendor "Opensuse" | Leap Search vendor "Opensuse" for product "Leap" | 15.1 Search vendor "Opensuse" for product "Leap" and version "15.1" | - |
Affected
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Opensuse Search vendor "Opensuse" | Leap Search vendor "Opensuse" for product "Leap" | 15.2 Search vendor "Opensuse" for product "Leap" and version "15.2" | - |
Affected
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Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 20.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "20.04" | lts |
Affected
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