漏洞信息
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Vulnerability Title
concurrent-ruby: `ReentrantReadWriteLock` read-count overflow grants a write lock without exclusivity
Vulnerability Description
concurrent-ruby is a modern concurrency tools for Ruby. Prior to 1.3.7, Concurrent::ReentrantReadWriteLock can incorrectly grant a write lock after one thread acquires the read lock 32,768 times. The lock stores a thread's local read and write hold counts in one integer. The low 15 bits are used for the read hold count, and bit 15 is used as WRITE_LOCK_HELD. After 32,768 reentrant read acquisitions, the local read count crosses into the write-lock bit. try_write_lock then treats the thread as already holding a write lock and returns true without setting the global RUNNING_WRITER bit. This breaks the core mutual-exclusion guarantee: the caller is told it has a write lock, but other threads can still hold or acquire read locks at the same time. This vulnerability is fixed in 1.3.7.
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Vulnerability Type
超界折返处理错误
Vulnerability Title
ruby-concurrency Concurrent Ruby 数字错误漏洞
Vulnerability Description
ruby-concurrency Concurrent Ruby是ruby-concurrency组织开源的一款并发编程工具库。 ruby-concurrency concurrent-ruby 1.3.7之前版本存在数字错误漏洞,该漏洞源于Concurrent::ReentrantReadWriteLock锁在读计数器达到32768次后可能错误授权写锁,导致破坏核心互斥保证。
CVSS Information
N/A
Vulnerability Type
N/A