SB2021072217 - Multiple vulnerabilities in Apple tvOS
Published: July 22, 2021 Updated: February 16, 2022
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 20 secuirty vulnerabilities.
1) Input validation error (CVE-ID: CVE-2021-30781)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to insufficient validation of user-supplied input within the Audio subsystem. A local user can execute arbitrary code with elevated privileges.
2) Use-after-free (CVE-ID: CVE-2021-30802)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error when processing images on web pages. A remote attacker can create a specially crafted web content, trigger a use-after-free error and execute arbitrary code on the system.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
3) Input validation error (CVE-ID: CVE-2021-30797)
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to insufficient validation of user-supplied input in WebKit. A remote attacker can trick the victim to visit a specially crafted website and execute arbitrary code on the system.
4) Use-after-free (CVE-ID: CVE-2021-30795)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error when processing HTML content in WebKit. A remote attacker can create a specially crafted website, trick the victim into visiting it, trigger a use-after-free error and execute arbitrary code on the system.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
5) Type Confusion (CVE-ID: CVE-2021-30758)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a type confusion error in WebKit. A remote attacker can trick the victim to open a specially crafted website, trigger a type confusion error and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
6) Use-after-free (CVE-ID: CVE-2021-3518)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in libxml2. A remote attacker can use a specially crafted file and execute arbitrary code on the target system.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
7) Security features bypass (CVE-ID: CVE-2021-30770)
The vulnerability allows a local application to escalate privileges on the system.
The vulnerability exists due to a logic error within the OS Kernel subsystem. A local application that has already achieved kernel code execution may be able to bypass kernel memory mitigations.
8) Security restrictions bypass (CVE-ID: CVE-2021-30769)
The vulnerability allows a local application to bypass implemented security restrictions.
The vulnerability exists due to a logic issue within OS Kernel subsystem. A local application can bypass Pointer Authentication.
9) Buffer overflow (CVE-ID: CVE-2021-30785)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing image files in ImageIO. A remote attacker can create a specially crafted PICT file, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
10) Buffer overflow (CVE-ID: CVE-2021-30779)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing image files in ImageIO. A remote attacker can create a specially crafted image, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
11) Improper Verification of Cryptographic Signature (CVE-ID: CVE-2021-30773)
The vulnerability allows a local application to bypass implemented security restrictions.
The vulnerability exists due to improper signature validation within the Identity Service component. A malicious application can bypass code signing checks.
12) Buffer overflow (CVE-ID: CVE-2021-30775)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing audio files within the CoreAudio subsystem. A remote attacker can create a specially crafted audio file, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
13) Stack-based buffer overflow (CVE-ID: CVE-2021-30759)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing font files in FontParser in libType1Scaler library. A remote unauthenticated attacker can trick the victim to open a specially crafted PFB font file, trigger stack-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
14) Out-of-bounds read (CVE-ID: CVE-2021-30788)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition in FontParser component. A remote attacker can create a specially crafted TTF font file, trick the victim into opening it, trigger out-of-bounds read error and read contents of memory on the system.
15) Integer overflow (CVE-ID: CVE-2021-30760)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to integer overflow in FontParser. A remote attacker can pass specially crafted font file, trigger integer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
16) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-30768)
The vulnerability allows a local application to bypass sandbox restrictions.
The vulnerability exists due to improperly imposed security restrictions within the dyld component. A sandboxed process may be able to circumvent sandbox restrictions.
17) Out-of-bounds write (CVE-ID: CVE-2021-30780)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error within CVMS subsystem. A local user can trigger out-of-bounds write and execute arbitrary code with root privileges.
18) Input validation error (CVE-ID: CVE-2021-30774)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to insufficient validation of user-supplied input within Crash Reporter. A local user can execute arbitrary code with root privileges.
19) Out-of-bounds read (CVE-ID: CVE-2021-30789)
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to a boundary condition within the CoreText component. A remote attacker can create a specially crafted font file, trick the victim into opening it, trigger out-of-bounds read error and execute arbitrary code on the system.
20) Input validation error (CVE-ID: CVE-2021-30776)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input within the CoreAudio subsystem. A remote attacker can pass specially crafted audio file to the application and perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.