CVE-2023-36478
HTTP/2 HPACK integer overflow and buffer allocation
描述
Eclipse Jetty provides a web server and servlet container. In versions 11.0.0 through 11.0.15, 10.0.0 through 10.0.15, and 9.0.0 through 9.4.52, an integer overflow in `MetaDataBuilder.checkSize` allows for HTTP/2 HPACK header values to exceed their size limit. `MetaDataBuilder.java` determines if a header name or value exceeds the size limit, and throws an exception if the limit is exceeded. However, when length is very large and huffman is true, the multiplication by 4 in line 295 will overflow, and length will become negative. `(_size+length)` will now be negative, and the check on line 296 will not be triggered. Furthermore, `MetaDataBuilder.checkSize` allows for user-entered HPACK header value sizes to be negative, potentially leading to a very large buffer allocation later on when the user-entered size is multiplied by 2. This means that if a user provides a negative length value (or, more precisely, a length value which, when multiplied by the 4/3 fudge factor, is negative), and this length value is a very large positive number when multiplied by 2, then the user can cause a very large buffer to be allocated on the server. Users of HTTP/2 can be impacted by a remote denial of service attack. The issue has been fixed in versions 11.0.16, 10.0.16, and 9.4.53. There are no known workarounds.
如何修補 CVE-2023-36478
要修補 CVE-2023-36478,請將受影響套件升級到下列已修補版本。
- —升級至 2.428.0 或更新版本
- —升級至 9.4.50-4+deb11u1 或更新版本
- —升級至 9.4.50-4+deb11u1 或更新版本
- —升級至 10.0.16 或更新版本
- —升級至 10.0.16 或更新版本
CVE-2023-36478 正在被利用嗎?
低 — EPSS 為 3.8%,目前沒有觀察到大規模利用活動。