低危 apache http_server 空指针解引用

CVE编号

CVE-2021-31618

利用情况

暂无

补丁情况

官方补丁

披露时间

2021-06-15
漏洞描述
Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of these restrictions and HTTP response is sent to the client with a status code indicating why the request was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the offending header was the very first one received or appeared in a a footer. This led to a NULL pointer dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2 request is easy to craft and submit, this can be exploited to DoS the server. This issue affected mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never released.
解决建议
建议您更新当前系统或软件至最新版,完成漏洞的修复。
受影响软件情况
# 类型 厂商 产品 版本 影响面
1
运行在以下环境
应用 apache http_server 1.15.17 -
运行在以下环境
应用 apache http_server 2.4.47 -
运行在以下环境
系统 alpine_3.10 httpd * Up to
(excluding)
2.4.48-r0
运行在以下环境
系统 alpine_3.11 httpd * Up to
(excluding)
2.4.48-r0
运行在以下环境
系统 alpine_3.12 httpd * Up to
(excluding)
2.4.48-r0
运行在以下环境
系统 alpine_3.13 httpd * Up to
(excluding)
2.4.48-r0
运行在以下环境
系统 alpine_3.14 httpd * Up to
(excluding)
2.4.48-r0
运行在以下环境
系统 alpine_3.15 httpd * Up to
(excluding)
2.4.48-r0
运行在以下环境
系统 alpine_3.16 httpd * Up to
(excluding)
2.4.48-r0
运行在以下环境
系统 alpine_edge httpd * Up to
(excluding)
2.4.48-r0
运行在以下环境
系统 amazon_2 httpd * Up to
(excluding)
2.4.46-2.amzn2
运行在以下环境
系统 debian_10 httpd * Up to
(excluding)
2.4.38-3+deb10u5
运行在以下环境
系统 debian_9 httpd * Up to
(excluding)
2.4.25-3+deb9u10
运行在以下环境
系统 fedora_33 httpd * Up to
(excluding)
1.15.19-1.fc33
运行在以下环境
系统 fedora_34 httpd * Up to
(excluding)
1.15.19-1.fc34
运行在以下环境
系统 opensuse_Leap_15.2 httpd * Up to
(excluding)
2.4.43-lp152.2.15.1
运行在以下环境
系统 opensuse_Leap_15.3 httpd * Up to
(excluding)
2.4.43-3.22.1
运行在以下环境
系统 suse_12_SP5 httpd * Up to
(excluding)
2.4.23-29.74.1
阿里云评分
3.6
  • 攻击路径
    远程
  • 攻击复杂度
    容易
  • 权限要求
    无需权限
  • 影响范围
    有限影响
  • EXP成熟度
    N/A
  • 补丁情况
    官方补丁
  • 数据保密性
    无影响
  • 数据完整性
    无影响
  • 服务器危害
    DoS
  • 全网数量
    N/A
CWE-ID 漏洞类型
CWE-476 空指针解引用
阿里云安全产品覆盖情况