CVSS: 7.5EPSS: 0%CPEs: 39EXPL: 0CVE-2021-3697 – grub2: Crafted JPEG image can lead to buffer underflow write in the heap
https://notcve.org/view.php?id=CVE-2021-3697
A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap. To a successful to be performed the attacker needs to perform some triage over the heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12. Una imagen JPEG diseñada puede conllevar que el lector de JPEG desborde su puntero de datos, permitiendo que los datos controlados por el usuario sean escritos en la pila. • https://bugzilla.redhat.com/show_bug.cgi?id=1991687 https://security.gentoo.org/glsa/202209-12 https://security.netapp.com/advisory/ntap-20220930-0001 https://access.redhat.com/security/cve/CVE-2021-3697 • CWE-787: Out-of-bounds Write •
CVSS: 8.1EPSS: 0%CPEs: 2EXPL: 0CVE-2022-28734 – Out-of-bounds write when handling split HTTP headers
https://notcve.org/view.php?id=CVE-2022-28734
Out-of-bounds write when handling split HTTP headers; When handling split HTTP headers, GRUB2 HTTP code accidentally moves its internal data buffer point by one position. This can lead to a out-of-bound write further when parsing the HTTP request, writing a NULL byte past the buffer. It's conceivable that an attacker controlled set of packets can lead to corruption of the GRUB2's internal memory metadata. A flaw was found in grub2 when handling split HTTP headers. While processing a split HTTP header, grub2 wrongly advances its control pointer to the internal buffer by one position, which can lead to an out-of-bounds write. • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28734 https://security.netapp.com/advisory/ntap-20230825-0002 https://www.openwall.com/lists/oss-security/2022/06/07/5 https://access.redhat.com/security/cve/CVE-2022-28734 https://bugzilla.redhat.com/show_bug.cgi?id=2090463 • CWE-787: Out-of-bounds Write •
CVSS: 7.5EPSS: 0%CPEs: 41EXPL: 0CVE-2021-3695 – grub2: Crafted PNG grayscale images may lead to out-of-bounds write in heap
https://notcve.org/view.php?id=CVE-2021-3695
A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform some triage over the heap layout to achieve signifcant results, also the values written into the memory are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2 versions prior grub-2.12. Una imagen PNG en escala de grises de 16 bits diseñada puede conllevar a una escritura fuera de límites en el área de la pila. • https://bugzilla.redhat.com/show_bug.cgi?id=1991685 https://security.gentoo.org/glsa/202209-12 https://security.netapp.com/advisory/ntap-20220930-0001 https://access.redhat.com/security/cve/CVE-2021-3695 • CWE-787: Out-of-bounds Write •
CVSS: 8.1EPSS: 0%CPEs: 1EXPL: 0CVE-2022-28733 – Integer underflow in grub_net_recv_ip4_packets
https://notcve.org/view.php?id=CVE-2022-28733
Integer underflow in grub_net_recv_ip4_packets; A malicious crafted IP packet can lead to an integer underflow in grub_net_recv_ip4_packets() function on rsm->total_len value. Under certain circumstances the total_len value may end up wrapping around to a small integer number which will be used in memory allocation. If the attack succeeds in such way, subsequent operations can write past the end of the buffer. A flaw was found in grub2 when handling IPv4 packets. This flaw allows an attacker to craft a malicious packet, triggering an integer underflow in grub code. • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28733 https://security.netapp.com/advisory/ntap-20230825-0002 https://www.openwall.com/lists/oss-security/2022/06/07/5 https://access.redhat.com/security/cve/CVE-2022-28733 https://bugzilla.redhat.com/show_bug.cgi?id=2083339 • CWE-191: Integer Underflow (Wrap or Wraparound) •
CVSS: 7.8EPSS: 0%CPEs: 1EXPL: 0CVE-2022-28735 – grub2: shim_lock verifier allows non-kernel files to be loaded
https://notcve.org/view.php?id=CVE-2022-28735
The GRUB2's shim_lock verifier allows non-kernel files to be loaded on shim-powered secure boot systems. Allowing such files to be loaded may lead to unverified code and modules to be loaded in GRUB2 breaking the secure boot trust-chain. A flaw was found in grub2. The shim_lock verifier from grub2 allows non-kernel files to be loaded when secure boot is enabled, giving the possibility of unverified code or modules to be loaded when it should not be allowed. • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28735 https://security.netapp.com/advisory/ntap-20230825-0002 https://www.openwall.com/lists/oss-security/2022/06/07/5 https://access.redhat.com/security/cve/CVE-2022-28735 https://bugzilla.redhat.com/show_bug.cgi?id=2090857 • CWE-829: Inclusion of Functionality from Untrusted Control Sphere •