漏洞信息
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Vulnerability Title
Stack overflow in nscd due to unbounded alloca use
Vulnerability Description
The nscd service in the GNU C Library 2.3.4 onwards may crash due to a
stack overflow when a malicious DNS server returns too large a response
for a DNS query, resulting in degraded DNS resolution for the system.
Exploitation of this bug needs a system that has nscd enabled and using
an untrusted DNS server for name resolution, with the compromised DNS
server being capable of processing records large enough to result in a
stack overflow in an nscd thread stack. During experimentation, bind 9
was unable to handle large records, but that could change in future or
with a different name server. In typical installations, nscd is
executed in an isolated context as its own user without a shell, due to
which any compromise of that service is isolated.
There is a remote possibility of nscd cache corruption if an attacker
manages to get the stack pointer into a desired point in the heap,
potentially resulting in other caches in nscd being overwritten with
corrupt data through the stack overflow, until the buggy code path
eventually results in a crash.
Finally, a crash in nscd may result in performance degradation when
resolving names, but it does not result in a denial of service.
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
Vulnerability Type
未经控制的内存分配
Vulnerability Title
GNU glibc 资源管理错误漏洞
Vulnerability Description
GNU glibc是美国GNU基金会开源的一个 GNU 计划所实现的 C 标准库。 GNU glibc 2.3.4版本至2.45之前版本存在资源管理错误漏洞,该漏洞源于nscd服务在处理恶意DNS服务器返回的过大DNS查询响应时发生栈溢出,可能导致nscd崩溃、系统DNS解析性能下降,并可能造成nscd缓存损坏。
CVSS Information
N/A
Vulnerability Type
N/A