Amazon Linux AMI update for expat

Published: 2012-06-19

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2012-0876 CVE-2012-1148
CWE-ID	CWE-399 CWE-401
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Amazon Linux AMI Operating systems & Components / Operating system
Vendor	Amazon Web Services

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Resource management error

EUVDB-ID: #VU33114

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2012-0876

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

The XML parser (xmlparse.c) in expat before 2.1.0 computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via an XML file with many identifiers with the same value.

Mitigation

Update the affected packages:

i686:
    expat-devel-2.0.1-11.9.amzn1.i686
    expat-debuginfo-2.0.1-11.9.amzn1.i686
    expat-2.0.1-11.9.amzn1.i686

src:
    expat-2.0.1-11.9.amzn1.src

x86_64:
    expat-devel-2.0.1-11.9.amzn1.x86_64
    expat-2.0.1-11.9.amzn1.x86_64
    expat-debuginfo-2.0.1-11.9.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*

External links

https://alas.aws.amazon.com/ALAS-2012-89.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.

2) Memory leak

EUVDB-ID: #VU33116