In pygments 1.1+ fixed in 2.7.4 the lexers used to parse programming languages rely heavily on regular expressions. Some of the regular expressions have exponential or cubic worst-case complexity and are vulnerable to ReDoS. By crafting malicious input an attacker can cause a denial of service. — CVE-2021-27291

Zusammenfassung

Sicherheitshinweis CVE-2021-27291. In pygments 1.1+ fixed in 2.7.4 the lexers used to parse programming languages rely heavily on regular expressions. Some of the regular… Hersteller: Microsoft. Quelle: MSRC. Risiko: high. CVSS 7.5.…

Was tun?

Allgemeine, vorsichtige Schritte (bitte prüfe die offizielle Quelle für Details):

• Priorisiere sofort Patches oder Mitigations (hohes akutes Risiko).
• Identifiziere betroffene Produktversionen und prüfe, ob du betroffen bist.
• Spiele Hersteller-Updates/Patches ein oder setze empfohlene Mitigations um.
• Lies das offizielle Advisory für betroffene Versionen und konkrete Schritte.

Offizielles Advisory

Zur offiziellen Quelle

Mehr dazu

• <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 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