SB2017062023 - Gentoo update for GNU C Library

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) NULL pointer dereference (CVE-ID: CVE-2015-5180)

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in res_query in libresolv due to NULL pointer dereference. A remote attacker can cause the service to crash.

2) Improper access control (CVE-ID: CVE-2016-6323)

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

The makecontext function in the GNU C Library (aka glibc or libc6) before 2.25 creates execution contexts incompatible with the unwinder on ARM EABI (32-bit) platforms, which might allow context-dependent attackers to cause a denial of service (hang), as demonstrated by applications compiled using gccgo, related to backtrace generation.

3) Memory corruption (CVE-ID: CVE-2017-1000366)

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The vulnerability exists due to memory management errors in implementation of various functions under multiple operating systems. A local or remote attacker can trigger the affected application to process specially crafted LD_LIBRARY_PATH values to manipulate the heap/stack, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Remediation

Install update from vendor's website.

References

• https://security.gentoo.org/
• https://security.gentoo.org/glsa/201706-19