Multiple vulnerabilities in libyang
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 5 |
| CVE-ID | CVE-2021-28902 CVE-2021-28906 CVE-2021-28905 CVE-2021-28904 CVE-2021-28903 |
| CWE-ID | CWE-252 CWE-617 CWE-674 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
libyang Universal components / Libraries / Libraries used by multiple products |
| Vendor | CESNET |
Security Bulletin
This security bulletin contains information about 5 vulnerabilities.
1) Unchecked Return Value
EUVDB-ID: #VU55301
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-2021-28902
CWE-ID:
CWE-252 - Unchecked Return Value
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to an unchecked return value in the "read_yin_container()" function. A remote attacker can run a specially crafted program to cause a denial of service condition.
MitigationInstall updates from vendor's website.
Vulnerable software versionslibyang: 1.0.109 - 1.0.225
CPE2.3- cpe:2.3:a:cesnet:libyang:1.0.109:*:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:1.0.130:*:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:1.0.167:*:*:*:*:*:*:*
https://github.com/CESNET/libyang/issues/1454
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) Unchecked Return Value
EUVDB-ID: #VU55305
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-2021-28906
CWE-ID:
CWE-252 - Unchecked Return Value
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to an unchecked return value in the "read_yin_leaf()" function. A remote attacker can run a specially crafted program to cause a denial of service condition.
MitigationInstall updates from vendor's website.
Vulnerable software versionslibyang: 1.0.109 - 1.0.225
CPE2.3- cpe:2.3:a:cesnet:libyang:1.0.109:*:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:1.0.130:*:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:1.0.167:*:*:*:*:*:*:*
https://github.com/CESNET/libyang/issues/1455
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) Reachable Assertion
EUVDB-ID: #VU55304
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-2021-28905
CWE-ID:
CWE-617 - Reachable Assertion
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a reachable assertion in the "lys_node_free()" function. A remote attacker can cause a denial of service condition on the target system.
MitigationInstall updates from vendor's website.
Vulnerable software versionslibyang: 1.0.109 - 1.0.225
CPE2.3- cpe:2.3:a:cesnet:libyang:1.0.109:*:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:1.0.130:*:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:1.0.167:*:*:*:*:*:*:*
https://github.com/CESNET/libyang/issues/1452
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) Unchecked Return Value
EUVDB-ID: #VU55303
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-2021-28904
CWE-ID:
CWE-252 - Unchecked Return Value
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to an unchecked return value in the "ext_get_plugin()" function. A remote attacker can run a specially crafted program to cause a denial of service condition.
MitigationInstall updates from vendor's website.
Vulnerable software versionslibyang: 1.0.109 - 1.0.225
CPE2.3- cpe:2.3:a:cesnet:libyang:1.0.109:*:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:1.0.130:*:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:1.0.167:*:*:*:*:*:*:*
https://github.com/CESNET/libyang/issues/1451
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) Uncontrolled Recursion
EUVDB-ID: #VU55302
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-2021-28903
CWE-ID:
CWE-674 - Uncontrolled Recursion
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to an uncontrolled recursion in the "lyxml_parse_elem()" function. A remote attacker can cause a denial of service condition on the target system.
MitigationInstall updates from vendor's website.
Vulnerable software versionslibyang: 1.0.109 - 1.0.225
CPE2.3- cpe:2.3:a:cesnet:libyang:1.0.109:*:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:1.0.130:*:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:1.0.167:*:*:*:*:*:*:*
https://github.com/CESNET/libyang/issues/1453
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.
