Ubuntu update for glibc



| Updated: 2025-05-20
Risk Low
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2023-6779
CVE-2023-6246
CVE-2023-6780
CWE-ID CWE-193
CWE-122
CWE-190
Exploitation vector Local
Public exploit Public exploit code for vulnerability #2 is available.
Vulnerable software
 Ubuntu
Operating systems & Components / Operating system

libc6 (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Off-by-one

EUVDB-ID: #VU85934

Risk: Low

CVSSv4.0: 5.9 [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:U/U:Clear]

CVE-ID: CVE-2023-6779

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

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to an off-by-one error within the __vsyslog_internal() function. A local user can trigger memory corruption and execute arbitrary code with elevated privileges.

Mitigation

Update the affected package glibc to the latest version.

Vulnerable software versions

Ubuntu: 23.10

libc6 (Ubuntu package): before 2.38-1ubuntu6.1

CPE2.3 External links

https://ubuntu.com/security/notices/USN-6620-1


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.

2) Heap-based buffer overflow

EUVDB-ID: #VU85932

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-2023-6246

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: Yes

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error within the __vsyslog_internal() function, which is called by both syslog() and vsyslog() while printing the SYSLOG_HEADER containing a long program name. A local user can pass a specially crafted input as arguments to the affected application, trigger a heap-based buffer overflow and execute arbitrary code on the system.


Mitigation

Update the affected package glibc to the latest version.

Vulnerable software versions

Ubuntu: 23.10

libc6 (Ubuntu package): before 2.38-1ubuntu6.1

CPE2.3 External links

https://ubuntu.com/security/notices/USN-6620-1


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.

3) Integer overflow

EUVDB-ID: #VU85935

Risk: Low

CVSSv4.0: 5.9 [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:U/U:Clear]

CVE-ID: CVE-2023-6780

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to integer overflow within the __vsyslog_internal() function. A local user can pass specially crafted input to the affected application, trigger an integer overflow and execute arbitrary code with elevated privileges.

Mitigation

Update the affected package glibc to the latest version.

Vulnerable software versions

Ubuntu: 23.10

libc6 (Ubuntu package): before 2.38-1ubuntu6.1

CPE2.3 External links

https://ubuntu.com/security/notices/USN-6620-1


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.



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