SB2018022022 - OpenSUSE Linux update for glibc

Description

This security bulletin contains information about 5 secuirty vulnerabilities.

1) Spoofing attack (CVE-ID: CVE-2017-12132)

The vulnerability allows a remote attacker to perform spoofing attack and write arbitrary files on the target system.

The weakness exists in the DNS stub resolver due to soliciting large UDP responses from name servers, potentially simplifying off-path DNS spoofing attacks due to IP fragmentation, when EDNS support is enabled. A remote attacker can write arbitrary files.

2) Denial of service (CVE-ID: CVE-2017-8804)

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

The vulnerability exists due to an error in xdr_bytes() and xdr_string() functions when processing RPC data in the GNU C Library (aka glibc or libc6). A remote unauthenticated attacker can send a specially crafted UDP request to port 111 (rpcbind) and consume up to 4 gigabytes of memory per request.

Successful exploitation of this vulnerability may result in denial of service (DoS) conditions.

The issue is related to: https://www.cybersecurity-help.cz/vdb/SB2017050801

3) Privilege escalation (CVE-ID: CVE-2018-1000001)

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

The weakness exists in due to a change in the processing of pathnames in the getcwd() command introduced in Linux kernel. A local attacker can use a specially crafted application, trigger buffer underflow in the __realpath() function in 'stdlib/canonicalize.c' and execute arbitrary code with root privileges.

Successful exploitation of the vulnerability may result in system compromise.

4) Integer overflow (CVE-ID: CVE-2018-6485)

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

The weakness exists in the implementation of the posix_memalign in memalign functions due to integer overflow when causing these functions to return a pointer to a heap area that is too small. A remote attacker can trigger memory corruption and gain root privileges.

5) Integer overflow (CVE-ID: CVE-2018-6551)

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

The weakness exists in the malloc implementation due to improper handling of malloc calls with arguments close to SIZE_MAX and returning a pointer to a heap region that is smaller than requested. A remote attacker can gain root privileges.

Remediation

Install update from vendor's website.

References

• https://lists.opensuse.org/opensuse-security-announce/2018-02/msg00039.html