CVE-2018-14633: canonical ubuntu_linux Stack-based Buffer Overflow

Vulnerability summary

CVE-2018-14633 is a high (CVSS 8.3) Stack-based Buffer Overflow vulnerability in canonical ubuntu_linux. EPSS estimates a 8.74% chance of exploitation in the next 30 days, higher than 95.1% of scored vulnerabilities.

Timeline

1. 25-09-2018
   PublishedVulnerability first disclosed.
2. 05-08-2024
   Last modifiedVulnerability information updated.

Description

A security flaw was found in the chap_server_compute_md5() function in the ISCSI target code in the Linux kernel in a way an authentication request from an ISCSI initiator is processed. An unauthenticated remote attacker can cause a stack buffer overflow and smash up to 17 bytes of the stack. The attack requires the iSCSI target to be enabled on the victim host. Depending on how the target's code was built (i.e. depending on a compiler, compile flags and hardware architecture) an attack may lead to a system crash and thus to a denial-of-service or possibly to a non-authorized access to data exported by an iSCSI target. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is highly unlikely. Kernel versions 4.18.x, 4.14.x and 3.10.x are believed to be vulnerable.

• CWE-121Stack-based Buffer OverflowThe product writes past the end of a buffer that was allocated on the stack.
• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.