CVE-2018-6548: webmproject libwebm Use After Free

Vulnerability summary

CVE-2018-6548 is a critical (CVSS 9.8) Use After Free vulnerability in webmproject libwebm. EPSS estimates a 1.39% chance of exploitation in the next 30 days, higher than 71.8% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 02-02-2018
   PublishedVulnerability first disclosed.
2. 05-08-2024
   Last modifiedVulnerability information updated.

Description

A use-after-free issue was discovered in libwebm through 2018-02-02. If a Vp9HeaderParser was initialized once before, its property frame_ would not be changed because of code in vp9parser::Vp9HeaderParser::SetFrame. Its frame_ could be freed while the corresponding pointer would not be updated, leading to a dangling pointer. This is related to the function OutputCluster in webm_info.cc.

• CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.