2019-17543 | Oracle MySQL Server LZ4 out-of-bounds write

By Max On Jul 24, 2021

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7.4	$5k-$25k	0.63

A vulnerability was found in Oracle MySQL Server up to 5.7.34/8.0.25 (Database Software) and classified as critical. This issue affects an unknown functionality of the component LZ4. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-787. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

LZ4 before 1.9.2 has a heap-based buffer overflow in LZ4_write32 (related to LZ4_compress_destSize), affecting applications that call LZ4_compress_fast with a large input. (This issue can also lead to data corruption.) NOTE: the vendor states “only a few specific / uncommon usages of the API are at risk.”

The weakness was shared 07/20/2021 as Oracle Critical Patch Update Advisory – July 2021. It is possible to read the advisory at oracle.com. The identification of this vulnerability is CVE-2019-17543 since 10/14/2019. The exploitation is known to be difficult. The attack may be initiated remotely. The successful exploitation needs a simple authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/24/2021).

Upgrading eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

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