Amazon Linux AMI update for libxml2



Published: 2020-08-12 | Updated: 2023-04-12
Risk High
Patch available YES
Number of vulnerabilities 7
CVE-ID CVE-2015-8035
CVE-2016-5131
CVE-2017-15412
CVE-2017-18258
CVE-2018-14404
CVE-2018-14567
CVE-2018-9251
CWE-ID CWE-399
CWE-416
CWE-119
CWE-476
CWE-835
CWE-611
Exploitation vector Network
Public exploit Public exploit code for vulnerability #3 is available.
Public exploit code for vulnerability #5 is available.
Vulnerable software
Subscribe 		Amazon Linux AMI
Operating systems & Components / Operating system

Vendor Amazon Web Services

Security Bulletin

This security bulletin contains information about 7 vulnerabilities.

1) Resource management error

EUVDB-ID: #VU32381

Risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-8035

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

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

The xz_decomp function in xzlib.c in libxml2 2.9.1 does not properly detect compression errors, which allows context-dependent attackers to cause a denial of service (process hang) via crafted XML data.

Mitigation

Update the affected packages:

i686:
    libxml2-2.9.1-6.4.40.amzn1.i686
    libxml2-python26-2.9.1-6.4.40.amzn1.i686
    libxml2-devel-2.9.1-6.4.40.amzn1.i686
    libxml2-static-2.9.1-6.4.40.amzn1.i686
    libxml2-python27-2.9.1-6.4.40.amzn1.i686
    libxml2-debuginfo-2.9.1-6.4.40.amzn1.i686

src:
    libxml2-2.9.1-6.4.40.amzn1.src

x86_64:
    libxml2-python26-2.9.1-6.4.40.amzn1.x86_64
    libxml2-static-2.9.1-6.4.40.amzn1.x86_64
    libxml2-debuginfo-2.9.1-6.4.40.amzn1.x86_64
    libxml2-2.9.1-6.4.40.amzn1.x86_64
    libxml2-devel-2.9.1-6.4.40.amzn1.x86_64
    libxml2-python27-2.9.1-6.4.40.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2020-1415.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) Use-after-free

EUVDB-ID: #VU33135

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-5131

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when processing vectors related to the XPointer range-to function. A remote attackers can cause a denial of service or execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Update the affected packages:

i686:
    libxml2-2.9.1-6.4.40.amzn1.i686
    libxml2-python26-2.9.1-6.4.40.amzn1.i686
    libxml2-devel-2.9.1-6.4.40.amzn1.i686
    libxml2-static-2.9.1-6.4.40.amzn1.i686
    libxml2-python27-2.9.1-6.4.40.amzn1.i686
    libxml2-debuginfo-2.9.1-6.4.40.amzn1.i686

src:
    libxml2-2.9.1-6.4.40.amzn1.src

x86_64:
    libxml2-python26-2.9.1-6.4.40.amzn1.x86_64
    libxml2-static-2.9.1-6.4.40.amzn1.x86_64
    libxml2-debuginfo-2.9.1-6.4.40.amzn1.x86_64
    libxml2-2.9.1-6.4.40.amzn1.x86_64
    libxml2-devel-2.9.1-6.4.40.amzn1.x86_64
    libxml2-python27-2.9.1-6.4.40.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2020-1415.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.

3) Use-after-free error

EUVDB-ID: #VU9577

Risk: High

CVSSv3.1: 8.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2017-15412

CWE-ID: CWE-416 - Use After Free

Exploit availability: Yes

Description

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

The weakness exists due to use-after-free error in libXML. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation

Update the affected packages:

i686:
    libxml2-2.9.1-6.4.40.amzn1.i686
    libxml2-python26-2.9.1-6.4.40.amzn1.i686
    libxml2-devel-2.9.1-6.4.40.amzn1.i686
    libxml2-static-2.9.1-6.4.40.amzn1.i686
    libxml2-python27-2.9.1-6.4.40.amzn1.i686
    libxml2-debuginfo-2.9.1-6.4.40.amzn1.i686

src:
    libxml2-2.9.1-6.4.40.amzn1.src

x86_64:
    libxml2-python26-2.9.1-6.4.40.amzn1.x86_64
    libxml2-static-2.9.1-6.4.40.amzn1.x86_64
    libxml2-debuginfo-2.9.1-6.4.40.amzn1.x86_64
    libxml2-2.9.1-6.4.40.amzn1.x86_64
    libxml2-devel-2.9.1-6.4.40.amzn1.x86_64
    libxml2-python27-2.9.1-6.4.40.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2020-1415.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.

4) Memory corruption

EUVDB-ID: #VU15363

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-18258

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists in the xz_head() function of the GNOME libxml2 library, as defined in the xzlib.c source code due to boundary error in the Lempel-Ziv-Markov (LZMA) decompression feature. A remote unauthenticated attacker can trick the victim into opening a specially crafted LZMA file that submits malicious input, trigger memory corruption and cause the application to crash.

Mitigation

Update the affected packages:

i686:
    libxml2-2.9.1-6.4.40.amzn1.i686
    libxml2-python26-2.9.1-6.4.40.amzn1.i686
    libxml2-devel-2.9.1-6.4.40.amzn1.i686
    libxml2-static-2.9.1-6.4.40.amzn1.i686
    libxml2-python27-2.9.1-6.4.40.amzn1.i686
    libxml2-debuginfo-2.9.1-6.4.40.amzn1.i686

src:
    libxml2-2.9.1-6.4.40.amzn1.src

x86_64:
    libxml2-python26-2.9.1-6.4.40.amzn1.x86_64
    libxml2-static-2.9.1-6.4.40.amzn1.x86_64
    libxml2-debuginfo-2.9.1-6.4.40.amzn1.x86_64
    libxml2-2.9.1-6.4.40.amzn1.x86_64
    libxml2-devel-2.9.1-6.4.40.amzn1.x86_64
    libxml2-python27-2.9.1-6.4.40.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2020-1415.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.

5) Null pointer dereference

EUVDB-ID: #VU13949

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-14404

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists in the xmlXPathCompOpEval() function, as defined in the path.c source code file due to improper parsing of invalid XPath expressions in the XPATH_OP_AND and XPATH_OP_OR cases. A remote attacker can send a specially crafted request that submits malicious input to an application that is using the affected library, trigger a NULL pointer dereference and cause the application to crash.

Mitigation

Update the affected packages:

i686:
    libxml2-2.9.1-6.4.40.amzn1.i686
    libxml2-python26-2.9.1-6.4.40.amzn1.i686
    libxml2-devel-2.9.1-6.4.40.amzn1.i686
    libxml2-static-2.9.1-6.4.40.amzn1.i686
    libxml2-python27-2.9.1-6.4.40.amzn1.i686
    libxml2-debuginfo-2.9.1-6.4.40.amzn1.i686

src:
    libxml2-2.9.1-6.4.40.amzn1.src

x86_64:
    libxml2-python26-2.9.1-6.4.40.amzn1.x86_64
    libxml2-static-2.9.1-6.4.40.amzn1.x86_64
    libxml2-debuginfo-2.9.1-6.4.40.amzn1.x86_64
    libxml2-2.9.1-6.4.40.amzn1.x86_64
    libxml2-devel-2.9.1-6.4.40.amzn1.x86_64
    libxml2-python27-2.9.1-6.4.40.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2020-1415.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.

6) Infinite loop

EUVDB-ID: #VU14470

Risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-14567

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists in the liblzma error code of the GNOME libxml2 library due to an infinite loop condition in the Lempel–Ziv–Markov (LZMA) decompression feature during the processing of XML files. A remote attacker can trick the victim into opening an XML file that submits malicious input, trigger a LZMA_MEMLIMIT_ERROR condition and cause the service to crash.

Mitigation

Update the affected packages:

i686:
    libxml2-2.9.1-6.4.40.amzn1.i686
    libxml2-python26-2.9.1-6.4.40.amzn1.i686
    libxml2-devel-2.9.1-6.4.40.amzn1.i686
    libxml2-static-2.9.1-6.4.40.amzn1.i686
    libxml2-python27-2.9.1-6.4.40.amzn1.i686
    libxml2-debuginfo-2.9.1-6.4.40.amzn1.i686

src:
    libxml2-2.9.1-6.4.40.amzn1.src

x86_64:
    libxml2-python26-2.9.1-6.4.40.amzn1.x86_64
    libxml2-static-2.9.1-6.4.40.amzn1.x86_64
    libxml2-debuginfo-2.9.1-6.4.40.amzn1.x86_64
    libxml2-2.9.1-6.4.40.amzn1.x86_64
    libxml2-devel-2.9.1-6.4.40.amzn1.x86_64
    libxml2-python27-2.9.1-6.4.40.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2020-1415.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.

7) Infinite loop

EUVDB-ID: #VU15364

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-9251

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists in the xz_decomp() function of the GNOME libxml2 library, as defined in the xzlib.c source code due to an infinite loop condition in the Lempel-Ziv-Markov (LZMA) decompression feature during the processing of XML files. A remote unauthenticated attacker can trick the victim into opening a specially crafted XML file that submits malicious input, trigger an LZMA_MEMLIMIT_ERROR condition and cause the application to crash.

Mitigation

Update the affected packages:

i686:
    libxml2-2.9.1-6.4.40.amzn1.i686
    libxml2-python26-2.9.1-6.4.40.amzn1.i686
    libxml2-devel-2.9.1-6.4.40.amzn1.i686
    libxml2-static-2.9.1-6.4.40.amzn1.i686
    libxml2-python27-2.9.1-6.4.40.amzn1.i686
    libxml2-debuginfo-2.9.1-6.4.40.amzn1.i686

src:
    libxml2-2.9.1-6.4.40.amzn1.src

x86_64:
    libxml2-python26-2.9.1-6.4.40.amzn1.x86_64
    libxml2-static-2.9.1-6.4.40.amzn1.x86_64
    libxml2-debuginfo-2.9.1-6.4.40.amzn1.x86_64
    libxml2-2.9.1-6.4.40.amzn1.x86_64
    libxml2-devel-2.9.1-6.4.40.amzn1.x86_64
    libxml2-python27-2.9.1-6.4.40.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2020-1415.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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