SB2021071310 - Amazon Linux AMI update for glibc

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Main Vulnerability Database SB2021071310

SB2021071310 - Amazon Linux AMI update for glibc

Published: July 13, 2021

Security Bulletin ID SB2021071310
Severity
High
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 25% Medium 25% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 secuirty vulnerabilities.


1) Information disclosure (CVE-ID: CVE-2019-19126)

The vulnerability allows a local authenticated user to gain access to sensitive information.

On the x86-64 architecture, the GNU C Library (aka glibc) before 2.31 fails to ignore the LD_PREFER_MAP_32BIT_EXEC environment variable during program execution after a security transition, allowing local attackers to restrict the possible mapping addresses for loaded libraries and thus bypass ASLR for a setuid program.


2) Out-of-bounds read (CVE-ID: CVE-2019-25013)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition in GNU C Library within the iconv feature when processing multi-byte input sequences in the EUC-KR encoding. A remote attacker can pass specially crafted input to the application, trigger out-of-bounds read error and perform a denial of service (DoS) attack.


3) Stack-based buffer overflow (CVE-ID: CVE-2020-10029)

The vulnerability allows an attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within "sysdeps/ieee754/ldbl-96/e_rem_pio2l.c" in GNU C Library (aka glibc or libc6). An attacker can pas specially crafted input to the application and trigger a stack-based buffer overflow.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system or denial of service conditions.


4) Out-of-bounds write (CVE-ID: CVE-2020-29573)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary within the sysdeps/i386/ldbl2mpn.c in the GNU C Library on x86  systems. A remote attacker can pass specially crafted data to the application that uses the vulnerable version of glibc and crash it.


Remediation

Install update from vendor's website.

References