Bug 13721

Please patch CVEs for package grub2 version 2.06
  
INFO (CVEs are): grub2 2.06
 cves found
CVE-2021-3695
Desc: 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.
Link: https://nvd.nist.gov/vuln/detail/CVE-2021-3695
Severity: MEDIUM
CVE-2021-3696
Desc: A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be considered Low as it's very complex to an attacker control the encoding and positioning of corrupted Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.
Link: https://nvd.nist.gov/vuln/detail/CVE-2021-3696
Severity: MEDIUM
CVE-2021-3697
Desc: 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.
Link: https://nvd.nist.gov/vuln/detail/CVE-2021-3697
Severity: HIGH
CVE-2022-28733
Desc: 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.
Link: https://nvd.nist.gov/vuln/detail/CVE-2022-28733
Severity: HIGH
CVE-2022-28734
Desc: 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.
Link: https://nvd.nist.gov/vuln/detail/CVE-2022-28734
Severity: CRITICAL
CVE-2022-28735
Desc: 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.
Link: https://nvd.nist.gov/vuln/detail/CVE-2022-28735
Severity: HIGH
CVE-2022-28736
Desc: There's a use-after-free vulnerability in grub_cmd_chainloader() function; The chainloader command is used to boot up operating systems that doesn't support multiboot and do not have direct support from GRUB2. When executing chainloader more than once a use-after-free vulnerability is triggered. If an attacker can control the GRUB2's memory allocation pattern sensitive data may be exposed and arbitrary code execution can be achieved.
Link: https://nvd.nist.gov/vuln/detail/CVE-2022-28736
Severity: HIGH