Amazon Linux AMI update for libtirpc



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2017-8779
CWE-ID CWE-400
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 Amazon Linux AMI
Operating systems & Components / Operating system

Vendor Amazon Web Services

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Denial of service

EUVDB-ID: #VU6435

Risk: Medium

CVSSv4.0: 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/E:A/U:Green]

CVE-ID: CVE-2017-8779

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: Yes

Description

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 during memory allocation within rpcbind implementation. A remote unauthenticated attacker can send a specially crafted UDP request to port 111 and consume up to 4 gigabytes of memory per request.

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

Mitigation

Update the affected packages.

i686:
    libtirpc-0.2.4-0.8.14.amzn1.i686
    libtirpc-devel-0.2.4-0.8.14.amzn1.i686
    libtirpc-debuginfo-0.2.4-0.8.14.amzn1.i686

src:
    libtirpc-0.2.4-0.8.14.amzn1.src

x86_64:
    libtirpc-debuginfo-0.2.4-0.8.14.amzn1.x86_64
    libtirpc-devel-0.2.4-0.8.14.amzn1.x86_64
    libtirpc-0.2.4-0.8.14.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2017-840.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.



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