Multiple vulnerabilities in Glibc

1) Out-of-bounds write

EUVDB-ID: #VU50362

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-29573

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

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

The vulnerability exists due to a boundary within the sysdeps/i386/ldbl2mpn.c in the GNU C Library on x86 systems. A remote attacker can pass specially crafted data to the application that uses the vulnerable version of glibc and crash it.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Glibc: 1.00 - 2.22.90

CPE2.3

External links

https://security.gentoo.org/glsa/202101-20
https://security.netapp.com/advisory/ntap-20210122-0004/
https://sourceware.org/bugzilla/show_bug.cgi?id=26649
https://sourceware.org/pipermail/libc-alpha/2020-September/117779.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) Stack-based buffer overflow

EUVDB-ID: #VU110101

Risk: High

CVSSv4.0: N/A

CVE-ID: CVE-2015-8779

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

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 when processing a long catalog name. A remote unauthenticated attacker can trigger stack-based buffer overflow and execute arbitrary code on the target system.

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

Mitigation

Install update from vendor's website.

Vulnerable software versions

Glibc: 0.1 - 2.22.90

CPE2.3

External links

https://lists.fedoraproject.org/pipermail/package-announce/2016-May/184626.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00036.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00037.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00038.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00039.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00042.html
https://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.html
https://rhn.redhat.com/errata/RHSA-2017-0680.html
https://seclists.org/fulldisclosure/2019/Sep/7
https://www.debian.org/security/2016/dsa-3480
https://www.debian.org/security/2016/dsa-3481
https://www.openwall.com/lists/oss-security/2016/01/19/11
https://www.openwall.com/lists/oss-security/2016/01/20/1
https://www.securityfocus.com/bid/82244
https://www.ubuntu.com/usn/USN-2985-1
https://www.ubuntu.com/usn/USN-2985-2
https://access.redhat.com/errata/RHSA-2017:1916
https://seclists.org/bugtraq/2019/Sep/7
https://security.gentoo.org/glsa/201602-02
https://security.gentoo.org/glsa/201702-11
https://sourceware.org/bugzilla/show_bug.cgi?id=17905
https://www.sourceware.org/ml/libc-alpha/2016-02/msg00502.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) Input validation error

EUVDB-ID: #VU110102

Risk: High

CVSSv4.0: 6.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2015-8776

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to read data or crash the application.

The strftime function in the GNU C Library (aka glibc or libc6) before 2.23 allows context-dependent attackers to cause a denial of service (application crash) or possibly obtain sensitive information via an out-of-range time value.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Glibc: 0.1 - 2.22.90

CPE2.3

External links

https://lists.fedoraproject.org/pipermail/package-announce/2016-May/184626.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00036.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00037.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00038.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00039.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00042.html
https://rhn.redhat.com/errata/RHSA-2017-0680.html
https://www.debian.org/security/2016/dsa-3480
https://www.debian.org/security/2016/dsa-3481
https://www.openwall.com/lists/oss-security/2016/01/19/11
https://www.openwall.com/lists/oss-security/2016/01/20/1
https://www.securityfocus.com/bid/83277
https://www.ubuntu.com/usn/USN-2985-1
https://www.ubuntu.com/usn/USN-2985-2
https://access.redhat.com/errata/RHSA-2017:1916
https://security.gentoo.org/glsa/201602-02
https://security.gentoo.org/glsa/201702-11
https://sourceware.org/bugzilla/show_bug.cgi?id=18985
https://www.sourceware.org/ml/libc-alpha/2016-02/msg00502.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.

4) Buffer overflow

EUVDB-ID: #VU110103

Risk: High

CVSSv4.0: 8.1 [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:U/U:Amber]

CVE-ID: CVE-2015-8778

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

Integer overflow in the GNU C Library (aka glibc or libc6) before 2.23 allows context-dependent attackers to cause a denial of service (application crash) or possibly execute arbitrary code via the size argument to the __hcreate_r function, which triggers out-of-bounds heap-memory access.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Glibc: 0.1 - 2.22.90

CPE2.3

External links

https://lists.fedoraproject.org/pipermail/package-announce/2016-May/184626.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00036.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00037.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00038.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00039.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00042.html
https://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.html
https://rhn.redhat.com/errata/RHSA-2017-0680.html
https://seclists.org/fulldisclosure/2019/Sep/7
https://www.debian.org/security/2016/dsa-3480
https://www.debian.org/security/2016/dsa-3481
https://www.openwall.com/lists/oss-security/2016/01/19/11
https://www.openwall.com/lists/oss-security/2016/01/20/1
https://www.securityfocus.com/bid/83275
https://www.ubuntu.com/usn/USN-2985-1
https://www.ubuntu.com/usn/USN-2985-2
https://access.redhat.com/errata/RHSA-2017:1916
https://seclists.org/bugtraq/2019/Sep/7
https://security.gentoo.org/glsa/201602-02
https://security.gentoo.org/glsa/201702-11
https://sourceware.org/bugzilla/show_bug.cgi?id=18240
https://www.sourceware.org/ml/libc-alpha/2016-02/msg00502.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) Stack-based buffer overflow

EUVDB-ID: #VU110104

Risk: High

CVSSv4.0: N/A

CVE-ID: CVE-2014-9761

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

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 when processing a long argument to the (1) nan, (2) nanf, or (3) nanl function. A remote unauthenticated attacker can trigger stack-based buffer overflow and execute arbitrary code on the target system.

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

Mitigation

Install update from vendor's website.

Vulnerable software versions

Glibc: 0.1 - 2.22.90

CPE2.3

External links

https://lists.fedoraproject.org/pipermail/package-announce/2016-May/184626.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00036.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00037.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00038.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00039.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00042.html
https://packetstormsecurity.com/files/153278/WAGO-852-Industrial-Managed-Switch-Series-Code-Execution-Hardcoded-Credentials.html
https://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.html
https://rhn.redhat.com/errata/RHSA-2017-0680.html
https://seclists.org/fulldisclosure/2019/Jun/18
https://seclists.org/fulldisclosure/2019/Sep/7
https://www.openwall.com/lists/oss-security/2016/01/19/11
https://www.openwall.com/lists/oss-security/2016/01/20/1
https://www.securityfocus.com/bid/83306
https://www.ubuntu.com/usn/USN-2985-1
https://www.ubuntu.com/usn/USN-2985-2
https://access.redhat.com/errata/RHSA-2017:1916
https://seclists.org/bugtraq/2019/Jun/14
https://seclists.org/bugtraq/2019/Sep/7
https://security.gentoo.org/glsa/201702-11
https://sourceware.org/bugzilla/show_bug.cgi?id=16962
https://www.sourceware.org/ml/libc-alpha/2016-02/msg00502.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.

6) Security features bypass

EUVDB-ID: #VU110105

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2015-8777

CWE-ID: CWE-254 - Security Features

Exploit availability: No

Description

The vulnerability allows a local user to manipulate data.

The process_envvars function in elf/rtld.c in the GNU C Library (aka glibc or libc6) before 2.23 allows local users to bypass a pointer-guarding protection mechanism via a zero value of the LD_POINTER_GUARD environment variable.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Glibc: 0.1 - 2.22.90

CPE2.3

External links

https://hmarco.org/bugs/glibc_ptr_mangle_weakness.html
https://lists.fedoraproject.org/pipermail/package-announce/2016-February/177404.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00036.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00037.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00038.html
https://lists.opensuse.org/opensuse-security-announce/2016-02/msg00039.html
https://www.debian.org/security/2016/dsa-3480
https://www.openwall.com/lists/oss-security/2016/01/20/1
https://www.securityfocus.com/bid/81469
https://www.securitytracker.com/id/1034811
https://www.ubuntu.com/usn/USN-2985-1
https://www.ubuntu.com/usn/USN-2985-2
https://access.redhat.com/errata/RHSA-2017:1916
https://security.gentoo.org/glsa/201702-11
https://sourceware.org/bugzilla/show_bug.cgi?id=18928

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

Risk	High
Patch available	YES
Number of vulnerabilities	6
CVE-ID	CVE-2020-29573 CVE-2015-8779 CVE-2015-8776 CVE-2015-8778 CVE-2014-9761 CVE-2015-8777
CWE-ID	CWE-787 CWE-121 CWE-20 CWE-119 CWE-254
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Glibc Universal components / Libraries / Libraries used by multiple products
Vendor	GNU