SUSE update for libtasn1



Published: 2022-10-31
Risk Medium
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2017-6891
CVE-2018-1000654
CVE-2021-46848
CWE-ID CWE-121
CWE-20
CWE-193
Exploitation vector Network
Public exploit Public exploit code for vulnerability #2 is available.
Vulnerable software
Subscribe 		SUSE Linux Enterprise Server
Operating systems & Components / Operating system

libtasn1-debugsource
Operating systems & Components / Operating system package or component

libtasn1-debuginfo
Operating systems & Components / Operating system package or component

libtasn1-6-debuginfo-32bit
Operating systems & Components / Operating system package or component

libtasn1-6-debuginfo
Operating systems & Components / Operating system package or component

libtasn1-6-32bit
Operating systems & Components / Operating system package or component

libtasn1-6
Operating systems & Components / Operating system package or component

libtasn1
Operating systems & Components / Operating system package or component

Vendor SUSE

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Buffer overflow

EUVDB-ID: #VU6890

Risk: Medium

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-2017-6891

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

A remote attacker can execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in "asn1_find_node()" function (lib/parser_aux.c) within GnuTLS libtasn1 version 4.10 when processing a specially crafted assignments file via the e.g. asn1Coding utility. A remote attacker can trick the victim into opening a specially crafted file, trigger stack-based buffer overflow and execute arbitrary code with privileges of the current user.

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

Mitigation

Update the affected package libtasn1 to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server: 12-SP2-BCL

libtasn1-debugsource: before 3.7-13.7.1

libtasn1-debuginfo: before 3.7-13.7.1

libtasn1-6-debuginfo-32bit: before 3.7-13.7.1

libtasn1-6-debuginfo: before 3.7-13.7.1

libtasn1-6-32bit: before 3.7-13.7.1

libtasn1-6: before 3.7-13.7.1

libtasn1: before 3.7-13.7.1

External links

http://www.suse.com/support/update/announcement/2022/suse-su-20223797-1/


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) Input validation error

EUVDB-ID: #VU18290

Risk: Low

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

CVE-ID: CVE-2018-1000654

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to insufficient validation of user-supplied input within the _asn1_expand_object_id(p_tree) function when parsing a specially crafted file with asn1Parser binary. An attacker can create a specially crafted file, pass it to the application and consume all available CPU resources on the system.

Mitigation

Update the affected package libtasn1 to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server: 12-SP2-BCL

libtasn1-debugsource: before 3.7-13.7.1

libtasn1-debuginfo: before 3.7-13.7.1

libtasn1-6-debuginfo-32bit: before 3.7-13.7.1

libtasn1-6-debuginfo: before 3.7-13.7.1

libtasn1-6-32bit: before 3.7-13.7.1

libtasn1-6: before 3.7-13.7.1

libtasn1: before 3.7-13.7.1

External links

http://www.suse.com/support/update/announcement/2022/suse-su-20223797-1/


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.

3) Off-by-one

EUVDB-ID: #VU68858

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-46848

CWE-ID: CWE-193 - Off-by-one Error

Exploit availability: No

Description

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

The vulnerability exists due to an ETYPE_OK off-by-one error in asn1_encode_simple_der in Libtasn1. A remote attacker can pass specially crafted data to the application, trigger an off-by-one error and perform a denial of service (DoS) attack.

Mitigation

Update the affected package libtasn1 to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server: 12-SP2-BCL

libtasn1-debugsource: before 3.7-13.7.1

libtasn1-debuginfo: before 3.7-13.7.1

libtasn1-6-debuginfo-32bit: before 3.7-13.7.1

libtasn1-6-debuginfo: before 3.7-13.7.1

libtasn1-6-32bit: before 3.7-13.7.1

libtasn1-6: before 3.7-13.7.1

libtasn1: before 3.7-13.7.1

External links

http://www.suse.com/support/update/announcement/2022/suse-su-20223797-1/


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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