CVE-2018-12617: canonical ubuntu_linux Integer Overflow or Wraparound

Vulnerability summary

CVE-2018-12617 is a high (CVSS 7.5) Integer Overflow or Wraparound vulnerability in canonical ubuntu_linux. EPSS estimates a 24.59% chance of exploitation in the next 30 days, higher than 97.8% of scored vulnerabilities. 2 public exploits are recorded.

Timeline

1. 21-06-2018
   PublishedVulnerability first disclosed.
2. 05-08-2024
   Last modifiedVulnerability information updated.

Description

qmp_guest_file_read in qga/commands-posix.c and qga/commands-win32.c in qemu-ga (aka QEMU Guest Agent) in QEMU 2.12.50 has an integer overflow causing a g_malloc0() call to trigger a segmentation fault when trying to allocate a large memory chunk. The vulnerability can be exploited by sending a crafted QMP command (including guest-file-read with a large count value) to the agent via the listening socket.

• CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.