Denial of service in GNU C Library (glibc) - CVE-2017-8804

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Main Vulnerability Database Vulnerabilities #VU6434

Denial of service in GNU C Library (glibc) - CVE-2017-8804

Published: May 7, 2017 / Updated: May 8, 2017


Vulnerability identifier: #VU6434
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-8804
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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


Affected software

GNU C Library (glibc)
SUSE Linux
Dynamic System Analysis (DSA) Preboot
Integrated Management Module II (IMM2) for BladeCenter Systems
System x Integrated Management Module (IMM2)
Flex System Integrated Management Module (IMM2)
Flex System Chassis Management Module (CMM)

How to mitigate CVE-2017-8804

Install patch from vendor's website.

Dynamic System Analysis (DSA) Preboot - update to dsyte2z-9.65
System x Integrated Management Module (IMM2) - update to 1AOO84C-6.80
Flex System Integrated Management Module (IMM2) - update to 1AOO84C-6.80
Integrated Management Module II (IMM2) for BladeCenter Systems - update to 1AOO84C-6.80-bc
Flex System Chassis Management Module (CMM) - update to 2pet16c-2.5.12c

External References

Related Security Bulletins