SB2020120610 - Multiple vulnerabilities in Glibc

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Main Vulnerability Database SB2020120610

SB2020120610 - Multiple vulnerabilities in Glibc

Published: December 6, 2020 Updated: June 3, 2025

Security Bulletin ID SB2020120610
Severity
High
Patch available
YES
Number of vulnerabilities 6
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 67% Medium 17% Low 17%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 6 secuirty vulnerabilities.


1) 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.


2) Stack-based buffer overflow (CVE-ID: CVE-2015-8779)

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

The vulnerability exists due to a boundary error when processing a long catalog name. A remote unauthenticated attacker can 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.


3) Input validation error (CVE-ID: CVE-2015-8776)

The vulnerability allows a remote non-authenticated attacker to read data or crash the application.

The strftime function in the GNU C Library (aka glibc or libc6) before 2.23 allows context-dependent attackers to cause a denial of service (application crash) or possibly obtain sensitive information via an out-of-range time value.


4) Buffer overflow (CVE-ID: CVE-2015-8778)

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

Integer overflow in the GNU C Library (aka glibc or libc6) before 2.23 allows context-dependent attackers to cause a denial of service (application crash) or possibly execute arbitrary code via the size argument to the __hcreate_r function, which triggers out-of-bounds heap-memory access.


5) Stack-based buffer overflow (CVE-ID: CVE-2014-9761)

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

The vulnerability exists due to a boundary error when processing a long argument to the (1) nan, (2) nanf, or (3) nanl function. A remote unauthenticated attacker can 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.


6) Security features bypass (CVE-ID: CVE-2015-8777)

The vulnerability allows a local user to manipulate data.

The process_envvars function in elf/rtld.c in the GNU C Library (aka glibc or libc6) before 2.23 allows local users to bypass a pointer-guarding protection mechanism via a zero value of the LD_POINTER_GUARD environment variable.


Remediation

Install update from vendor's website.

References