Fedora 32 update for sudo
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2019-18634 CVE-2019-19234 CVE-2019-19232 |
| CWE-ID | CWE-121 CWE-264 |
| Exploitation vector | Local |
| Public exploit | Public exploit code for vulnerability #1 is available. |
| Vulnerable software |
Fedora Operating systems & Components / Operating system sudo Operating systems & Components / Operating system package or component |
| Vendor | Fedoraproject |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Stack-based buffer overflow
EUVDB-ID: #VU24810
Risk: Low
CVSSv4.0: 7.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]
CVE-ID: CVE-2019-18634
CWE-ID:
CWE-121 - Stack-based buffer overflow
Exploit availability: Yes
DescriptionThe vulnerability allows a local user to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error within the getln() function in tgetpass.c, if pwfeedback is enabled in /etc/sudoers. A local user can trigger stack-based buffer overflow and execute arbitrary code on the target system with elevated privileges.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall updates from vendor's repository.
Vulnerable software versionsFedora: 32
sudo: before 1.9.0-0.1.b1.fc32
CPE2.3 External linkshttps://bodhi.fedoraproject.org/updates/FEDORA-2020-7c1b270959
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. However, proof of concept for this vulnerability is available.
2) Permissions, Privileges, and Access Controls
EUVDB-ID: #VU23782
Risk: Low
CVSSv4.0: 1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2019-19234
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a local user to impersonate other users on the system.
The vulnerability exists due to incorrect handling of the blocked users (e.g., by using the ! character in the shadow file instead of a password hash) in sudo. A local user with access to a Runas ALL sudoer account can impersonate blocked users.
Install updates from vendor's repository.
Vulnerable software versionsFedora: 32
sudo: before 1.9.0-0.1.b1.fc32
CPE2.3 External linkshttps://bodhi.fedoraproject.org/updates/FEDORA-2020-7c1b270959
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.
3) Permissions, Privileges, and Access Controls
EUVDB-ID: #VU23783
Risk: Low
CVSSv4.0: 1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2019-19232
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a local user to impersonate nonexistent users.
The vulnerability exists in sudo due to incorrect processing of numeric uids that are not associated with any existing user account. A local user with access to a Runas ALL sudoer accountcan impersonate a a nonexistent user.
MitigationInstall updates from vendor's repository.
Vulnerable software versionsFedora: 32
sudo: before 1.9.0-0.1.b1.fc32
CPE2.3 External linkshttps://bodhi.fedoraproject.org/updates/FEDORA-2020-7c1b270959
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.
