Buffer Overflow in GNU C Library's Dynamic Loader ld.so Could Allow Local Attacker to Execute Code with Elevated Privileges
Key Information
- Vendor
- Red Hat
- Status
- glibc
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 8.6 Extended Update Support
- Red Hat Enterprise Linux 9
- Vendor
- CVE Published:
- 3 October 2023
Badges
Summary
The first article discusses two different critical vulnerabilities in the GNU C Library (glibc) that allow unprivileged attackers to gain root access on multiple major Linux distributions. The vulnerabilities are tracked as CVE-2023-4911 and CVE-2023-6246 and both can lead to local privilege escalation. CVE-2023-4911 was already exploited by ransomware groups to steal cloud service provider (CSP) credentials in Kinsing malware attacks. The second vulnerability, CVE-2023-6246, was found in glibc's __vsyslog_internal() function and allows any unprivileged user to escalate privileges to full root access on default installations of various Linux distributions. The impact of these vulnerabilities is significant due to the widespread use of the affected library, and organizations are urged to ensure their systems are secure against these vulnerabilities.
CISA Reported
CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2023-4911 as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace as recent news articles suggest the vulnerability is being used by ransomware groups.
The CISA's recommendation is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Exploit Proof of Concept (PoC)
PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.
News Articles
New Linux glibc flaw lets attackers get root on major distros
Unprivileged attackers can get root access on multiple major Linux distributions in default configurations by exploiting a newly disclosed local privilege escalation (LPE) vulnerability in the GNU C Library (glibc).
8 months ago
Help Net Security CVE-2023-4911Looney Tunables bug exploited for cryptojacking - Help Net Security
Kinsing threat actors have been exploiting the recently disclosed Looney Tunables vulnerability to target cloud-native environments.
10 months ago
Hackers exploit Looney Tunables Linux bug, steal cloud creds
The operators of the Kinsing malware are targeting cloud environments with systems vulnerable to
10 months ago
EPSS Score
2% chance of being exploited in the next 30 days.
CVSS V3.1
Timeline
- 👾
Exploit exists.
First article discovered by BleepingComputer
Vulnerability published.
Vulnerability Reserved.