Double Free Affecting libwebp package, versions <0.6.1-2ubuntu0.18.04.2
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Test your applications- Snyk ID SNYK-UBUNTU1804-LIBWEBP-5500117
- published 8 May 2023
- disclosed 20 Jun 2023
How to fix?
Upgrade Ubuntu:18.04 libwebp to version 0.6.1-2ubuntu0.18.04.2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libwebp package and not the libwebp package as distributed by Ubuntu.
See How to fix? for Ubuntu:18.04 relevant fixed versions and status.
There exists a use after free/double free in libwebp. An attacker can use the ApplyFiltersAndEncode() function and loop through to free best.bw and assign best = trial pointer. The second loop will then return 0 because of an Out of memory error in VP8 encoder, the pointer is still assigned to trial and the AddressSanitizer will attempt a double free.