Amazon Linux AMI update for git

Published: 2018-06-08 | Updated: 2018-06-12

Risk	High
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2018-11235 CVE-2018-11233
CWE-ID	CWE-20
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 information about 2 vulnerabilities.

1) Improper input validation

EUVDB-ID: #VU13047

Risk: High

CVSSv4.0: 8.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2018-11235

CWE-ID: CWE-20 - Improper input validation

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to improper validation of submodule "names" supplied via the untrusted .gitmodules file when appending them to the '$GIT_DIR/modules' directory. A remote attacker can return specially crafted data to create or overwrite files on the target user's system when the repository is cloned and execute arbitrary code with elevated privileges.

Mitigation

Update the affected packages.

i686:
    git-daemon-2.14.4-2.58.amzn1.i686
    git-2.14.4-2.58.amzn1.i686
    git-debuginfo-2.14.4-2.58.amzn1.i686
    git-svn-2.14.4-2.58.amzn1.i686

noarch:
    git-bzr-2.14.4-2.58.amzn1.noarch
    git-cvs-2.14.4-2.58.amzn1.noarch
    perl-Git-SVN-2.14.4-2.58.amzn1.noarch
    perl-Git-2.14.4-2.58.amzn1.noarch
    git-email-2.14.4-2.58.amzn1.noarch
    git-all-2.14.4-2.58.amzn1.noarch
    git-hg-2.14.4-2.58.amzn1.noarch
    emacs-git-2.14.4-2.58.amzn1.noarch
    git-p4-2.14.4-2.58.amzn1.noarch
    gitweb-2.14.4-2.58.amzn1.noarch
    emacs-git-el-2.14.4-2.58.amzn1.noarch

src:
    git-2.14.4-2.58.amzn1.src

x86_64:
    git-2.14.4-2.58.amzn1.x86_64
    git-daemon-2.14.4-2.58.amzn1.x86_64
    git-svn-2.14.4-2.58.amzn1.x86_64
    git-debuginfo-2.14.4-2.58.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-2018-1035.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, proof of concept for this vulnerability is available.

2) Improper input validation

EUVDB-ID: #VU13048

Risk: Low

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

CVE-ID: CVE-2018-11233