A flaw was found in RPM's signature check functionality when reading a package file. This flaw allows an attacker who can convince a victim to install a seemingly verifiable package whose signature header was modified to cause RPM database corruption and execute code. The highest threat from this vulnerability is to data integrity confidentiality and system availability. — CVE-2021-20271

Résumé

Avis CVE-2021-20271. A flaw was found in RPM's signature check functionality when reading a package file. This flaw allows an attacker who can convince a… Fournisseur : Microsoft. Source : MSRC. Risque : high. CVSS 7. Consultez la source…

Que faire

Mesures générales et prudentes (vérifiez les détails dans la source officielle) :

• Priorisez immédiatement les correctifs ou les mesures d’atténuation (risque actif).
• Identifiez les versions affectées dans votre inventaire et vérifiez si vous êtes concerné.
• Appliquez les correctifs/mises à jour du fournisseur ou les atténuations recommandées.
• Consultez l’avis officiel pour les versions affectées et les étapes de remédiation.

Avis officiel

Lire la source officielle

Avis associés

• <vuln:Note Title="Mariner" Type="Tag" Ordinal="20">Mariner CVE-2020-8277
• <vuln:Note Title="Mariner" Type="Tag" Ordinal="20">Mariner CVE-2020-8032
• <vuln:Note Title="Mariner" Type="Tag" Ordinal="20">Mariner CVE-2021-27803
• <vuln:Note Title="Mariner" Type="Tag" Ordinal="20">Mariner CVE-2021-21309
• A flaw was found in cairo's image-compositor.c in all versions prior to 1.17.4. This flaw allows an attacker who can provide a crafted input file to cairo's image-compositor (for example by convincing a user to open a file in an application using cairo or if an application uses cairo on untrusted input) to cause a stack buffer overflow -&gt; out-of-bounds WRITE. The highest impact from this vulnerability is to confidentiality integrity as well as system availability. CVE-2020-35492
• A flaw was found in grub2 in versions prior to 2.06 where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory. The table is further loaded and executed by the kernel defeating its Secure Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. CVE-2020-14372
• A flaw was found in grub2 in versions prior to 2.06. During USB device initialization descriptors are read with very little bounds checking and assumes the USB device is providing sane values. If properly exploited an attacker could trigger memory corruption leading to arbitrary code execution allowing a bypass of the Secure Boot mechanism. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. CVE-2020-25647
• A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. CVE-2021-20233
• A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. CVE-2020-27779
• A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. CVE-2020-25632
• A flaw was found in multiple versions of OpenvSwitch. Specially crafted LLDP packets can cause memory to be lost when allocating data to handle specific optional TLVs potentially causing a denial of service. The highest threat from this vulnerability is to system availability. CVE-2020-27827
• A heap-based buffer overflow flaw was found in libtiff in the handling of TIFF images in libtiff's TIFF2PDF tool. A specially crafted TIFF file can lead to arbitrary code execution. The highest threat from this vulnerability is to confidentiality integrity as well as system availability. CVE-2020-35524