Amazon Linux AMI update for python-lxml



Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2021-43818
CVE-2022-2309
CWE-ID CWE-79
CWE-476
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Amazon Linux AMI
Operating systems & Components / Operating system

python-lxml
Operating systems & Components / Operating system package or component

Vendor Amazon Web Services

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Cross-site scripting

EUVDB-ID: #VU59660

Risk: Low

CVSSv4.0: 1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-43818

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data within the HTML Cleaner in lxml.html. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Update the affected packages:

aarch64:
    python-lxml-debugsource-4.7.1-3.amzn2023.0.1.aarch64
    python3-lxml-debuginfo-4.7.1-3.amzn2023.0.1.aarch64
    python3-lxml-4.7.1-3.amzn2023.0.1.aarch64

src:
    python-lxml-4.7.1-3.amzn2023.0.1.src

x86_64:
    python-lxml-debugsource-4.7.1-3.amzn2023.0.1.x86_64
    python3-lxml-debuginfo-4.7.1-3.amzn2023.0.1.x86_64
    python3-lxml-4.7.1-3.amzn2023.0.1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

python-lxml: before 4.7.1-3

CPE2.3 External links

https://alas.aws.amazon.com/AL2023/ALAS-2023-034.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) NULL pointer dereference

EUVDB-ID: #VU66813

Risk: Medium

CVSSv4.0: 6.6 [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:U/U:Green]

CVE-ID: CVE-2022-2309

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error within the iterwalk() function. A remote attacker can pass specially crafted XML data to the application and perform a denial of service (DoS) attack.

Mitigation

Update the affected packages:

aarch64:
    python-lxml-debugsource-4.7.1-3.amzn2023.0.1.aarch64
    python3-lxml-debuginfo-4.7.1-3.amzn2023.0.1.aarch64
    python3-lxml-4.7.1-3.amzn2023.0.1.aarch64

src:
    python-lxml-4.7.1-3.amzn2023.0.1.src

x86_64:
    python-lxml-debugsource-4.7.1-3.amzn2023.0.1.x86_64
    python3-lxml-debuginfo-4.7.1-3.amzn2023.0.1.x86_64
    python3-lxml-4.7.1-3.amzn2023.0.1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

python-lxml: before 4.7.1-3

CPE2.3 External links

https://alas.aws.amazon.com/AL2023/ALAS-2023-034.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.



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