QID 981106

QID 981106: Python (pip) Security Update for hpack (GHSA-ffq8-576r-v26g)

A HTTP/2 implementation built using any version of the Python HPACK library between v1.0.0 and v2.2.0 could be targeted for a denial of service attack, specifically a so-called "HPACK Bomb" attack. This attack occurs when an attacker inserts a header field that is exactly the size of the HPACK dynamic header table into the dynamic header table. The attacker can then send a header block that is simply repeated requests to expand that field in the dynamic table. This can lead to a gigantic compression ratio of 4,096 or better, meaning that 16kB of data can decompress to 64MB of data on the target machine.

Successful exploitation of this vulnerability may affect the confidentiality, integrity, and availability of the targeted user.

CVSS V3 rated as High - 7.5 severity.

CVSS V2 rated as High - 7.8 severity.

Solution

Customers are advised to refer to GHSA-ffq8-576r-v26g for updates pertaining to this vulnerability.

Vendor References

GHSA-ffq8-576r-v26g - github.com/advisories/GHSA-ffq8-576r-v26g

CVEs related to QID 981106

CVE-2016-6581 |

Software Advisories

Advisory ID	Software	Component	Link
GHSA-ffq8-576r-v26g	hpack		github.com/advisories/GHSA-ffq8-576r-v26g

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