Amazon Linux AMI update for libxslt



Risk High
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2019-11068
CVE-2019-18197
CWE-ID CWE-264
CWE-119
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		Amazon Linux AMI
Operating systems & Components / Operating system

Vendor Amazon Web Services

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU18276

Risk: Medium

CVSSv3.1: 4.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-11068

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to an error within the xsltCheckRead() and xsltCheckWrite() functions when processing requests from remote servers. A remote attacker can trick the victim into opening a specially crafted URL that will result in "-1 error" code but the URL itself will be processed by the application later.

Successful exploitation of the vulnerability may allow an attacker to bypass certain security restrictions and perform XXE attacks.

Mitigation

Update the affected packages:

i686:
    libxslt-debuginfo-1.1.28-6.15.amzn1.i686
    libxslt-1.1.28-6.15.amzn1.i686
    libxslt-python26-1.1.28-6.15.amzn1.i686
    libxslt-devel-1.1.28-6.15.amzn1.i686
    libxslt-python27-1.1.28-6.15.amzn1.i686

src:
    libxslt-1.1.28-6.15.amzn1.src

x86_64:
    libxslt-1.1.28-6.15.amzn1.x86_64
    libxslt-debuginfo-1.1.28-6.15.amzn1.x86_64
    libxslt-python26-1.1.28-6.15.amzn1.x86_64
    libxslt-python27-1.1.28-6.15.amzn1.x86_64
    libxslt-devel-1.1.28-6.15.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3 External links

http://alas.aws.amazon.com/ALAS-2021-1463.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) Buffer overflow

EUVDB-ID: #VU21942

Risk: High

CVSSv3.1: 8.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-18197

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error within the xsltCopyText() function in transform.c in libxslt. A remote attacker can create a specially crafted XML document, pass it to the affected application, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Update the affected packages:

i686:
    libxslt-debuginfo-1.1.28-6.15.amzn1.i686
    libxslt-1.1.28-6.15.amzn1.i686
    libxslt-python26-1.1.28-6.15.amzn1.i686
    libxslt-devel-1.1.28-6.15.amzn1.i686
    libxslt-python27-1.1.28-6.15.amzn1.i686

src:
    libxslt-1.1.28-6.15.amzn1.src

x86_64:
    libxslt-1.1.28-6.15.amzn1.x86_64
    libxslt-debuginfo-1.1.28-6.15.amzn1.x86_64
    libxslt-python26-1.1.28-6.15.amzn1.x86_64
    libxslt-python27-1.1.28-6.15.amzn1.x86_64
    libxslt-devel-1.1.28-6.15.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3 External links

http://alas.aws.amazon.com/ALAS-2021-1463.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.



###SIDEBAR###