PT-2023-31505 · H2O · H2O

Marten-Seemann · Published 2023-12-12 · Updated 2023-12-19 · CVE-2023-50247

Positive Technologies (AI Summary)

CVSS v3.1

3.7

Low

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions h2o versions 2.3.0-beta and prior

Description The QUIC stack, as used by h2o, is susceptible to a state exhaustion attack. When h2o is serving HTTP/3, a remote attacker can exploit this vulnerability to progressively increase the memory retained by the QUIC stack. This can eventually cause h2o to abort due to memory exhaustion. HTTP/1 and HTTP/2 are not affected by this vulnerability as they do not use QUIC.

Recommendations For versions 2.3.0-beta and prior, consider disabling HTTP/3 support as a temporary workaround to mitigate the issue. Update to a version that includes the fix committed in d67e81d03be12a9d53dc8271af6530f40164cd35 to fully resolve the issue.

Exploit

Fix

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2023-50247

GHSA-2CH5-P59C-7MV6

Affected Products

H2O

References · 9

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/50xxx/CVE-2023-50247.json · Exploit
• https://github.com/h2o/h2o/security/advisories/GHSA-2ch5-p59c-7mv6 · Vendor Advisory
• https://github.com/h2o/h2o/commit/d67e81d03be12a9d53dc8271af6530f40164cd35 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2023-50247 · Security Note
• https://osv.dev/vulnerability/CVE-2023-50247 · Vendor Advisory
• https://twitter.com/CVEnew/status/1734668689000018260 · Twitter Post
• https://twitter.com/VulmonFeeds/status/1734689390990180474 · Twitter Post
• https://t.me/cvenotify/64220 · Telegram Post
• https://t.me/cvenotify/63345 · Telegram Post