CVSS: 8.8EPSS: 0%CPEs: 57EXPL: 1CVE-2021-25217 – A buffer overrun in lease file parsing code can be used to exploit a common vulnerability shared by dhcpd and dhclient
https://notcve.org/view.php?id=CVE-2021-25217
In ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted. • http://www.openwall.com/lists/oss-security/2021/05/26/6 https://cert-portal.siemens.com/productcert/pdf/ssa-406691.pdf https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf https://kb.isc.org/docs/cve-2021-25217 https://lists.debian.org/debian-lts-announce/2021/06/msg00002.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5QI4DYC7J4BGHEW3NH4XHMWTHYC36UK4 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/ • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer •
CVSS: 9.8EPSS: 0%CPEs: 71EXPL: 0CVE-2021-29998
https://notcve.org/view.php?id=CVE-2021-29998
An issue was discovered in Wind River VxWorks before 6.5. There is a possible heap overflow in dhcp client. Se detectó un problema en Wind River VxWorks versiones anteriores a 6.5. Se presenta un posible desbordamiento de la pila en el cliente dhcp • https://cert-portal.siemens.com/productcert/pdf/ssa-560465.pdf https://cert-portal.siemens.com/productcert/pdf/ssa-910883.pdf https://support2.windriver.com/index.php?page=security-notices https://us-cert.cisa.gov/ics/advisories/icsa-21-194-12 • CWE-787: Out-of-bounds Write •
CVSS: 5.9EPSS: 0%CPEs: 205EXPL: 0CVE-2021-3449 – NULL pointer deref in signature_algorithms processing
https://notcve.org/view.php?id=CVE-2021-3449
An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue. All OpenSSL 1.1.1 versions are affected by this issue. • http://www.openwall.com/lists/oss-security/2021/03/27/1 http://www.openwall.com/lists/oss-security/2021/03/27/2 http://www.openwall.com/lists/oss-security/2021/03/28/3 http://www.openwall.com/lists/oss-security/2021/03/28/4 https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf https://cert-portal.siemens.com/productcert/pdf/ssa-772220.pdf https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=fb9fa6b51defd48157eeb207f52181f735d96148 https://kb.pulse • CWE-476: NULL Pointer Dereference •
CVSS: 7.5EPSS: 0%CPEs: 8EXPL: 0CVE-2021-25676
https://notcve.org/view.php?id=CVE-2021-25676
A vulnerability has been identified in RUGGEDCOM RM1224 (V6.3), SCALANCE M-800 (V6.3), SCALANCE S615 (V6.3), SCALANCE SC-600 (All Versions >= V2.1 and < V2.1.3). Multiple failed SSH authentication attempts could trigger a temporary Denial-of-Service under certain conditions. When triggered, the device will reboot automatically. Se ha identificado una vulnerabilidad en RUGGEDCOM RM1224 (versión V6.3), SCALANCE M-800 (versión V6.3), SCALANCE S615 (versión V6.3), SCALANCE SC-600 (Todas las versiones posteriores a V2.1 y anteriores a V2.1.3) . Múltiples intentos fallidos de autenticación SSH podrían desencadenar una Denegación de Servicio temporal en determinadas condiciones. • https://cert-portal.siemens.com/productcert/pdf/ssa-296266.pdf https://us-cert.cisa.gov/ics/advisories/icsa-21-068-02 • CWE-307: Improper Restriction of Excessive Authentication Attempts •
CVSS: 8.8EPSS: 0%CPEs: 35EXPL: 0CVE-2021-25667
https://notcve.org/view.php?id=CVE-2021-25667
A vulnerability has been identified in RUGGEDCOM RM1224 (All versions >= V4.3 and < V6.4), SCALANCE M-800 (All versions >= V4.3 and < V6.4), SCALANCE S615 (All versions >= V4.3 and < V6.4), SCALANCE SC-600 Family (All versions >= V2.0 and < V2.1.3), SCALANCE XB-200 (All versions < V4.1), SCALANCE XC-200 (All versions < V4.1), SCALANCE XF-200BA (All versions < V4.1), SCALANCE XM400 (All versions < V6.2), SCALANCE XP-200 (All versions < V4.1), SCALANCE XR-300WG (All versions < V4.1), SCALANCE XR500 (All versions < V6.2). Affected devices contain a stack-based buffer overflow vulnerability in the handling of STP BPDU frames that could allow a remote attacker to trigger a denial-of-service condition or potentially remote code execution. Successful exploitation requires the passive listening feature of the device to be active. Se ha identificado una vulnerabilidad en RUGGEDCOM RM1224 (Todas las versiones posteriores e incluyendo a V4.3 y anteriores a V6.4), SCALANCE M-800 (Todas las versiones posteriores e incluyendo a V4.3 y anteriores a V6.4), SCALANCE S615 (Todas las versiones posteriores e incluyendo a V4.3 y anteriores a V6.4), SCALANCE SC-600 Family (Todas las versiones posteriores e incluyendo a V2.0 y anteriores a V2.1.3), SCALANCE XB-200 (Todas las versiones anteriores a V4.1), SCALANCE XC-200 (Todas las versiones anteriores a V4.1), SCALANCE XF-200BA (Todas las versiones anteriores a V4.1), SCALANCE XM400 (Todas las versiones anteriores a V6.2), SCALANCE XP-200 (Todas las versiones anteriores a V4.1), SCALANCE XR-300WG (Todas las versiones anteriores a V4.1), SCALANCE XR500 (Todas las versiones anteriores a V6.2). Unos dispositivos afectados contienen una vulnerabilidad de desbordamiento de búfer en la región stack de la memoria en el manejo de frames STP BPDU que podría permitir a un atacante remoto desencadenar una condición de denegación de servicio o una ejecución de código potencialmente remoto. • https://cert-portal.siemens.com/productcert/pdf/ssa-979775.pdf https://us-cert.cisa.gov/ics/advisories/icsa-21-068-03 • CWE-121: Stack-based Buffer Overflow CWE-787: Out-of-bounds Write •