In Tor before 0.2.5.16, 0.2.6 through 0.2.8 before 0.2.8.17, 0.2.9 before 0.2.9.14, 0.3.0 before 0.3.0.13, and 0.3.1 before 0.3.1.9, there is a use-after-free in onion service v2 during intro-point expiration because the expiring list is mismanaged in certain error cases, aka TROVE-2017-013.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
| Link | Tags |
|---|---|
| https://bugs.torproject.org/24313 | issue tracking vendor advisory |
| https://blog.torproject.org/new-stable-tor-releases-security-fixes-0319-03013-02914-02817-02516 | vendor advisory |
| https://bugs.torproject.org/24430 | vendor advisory |
| https://www.debian.org/security/2017/dsa-4054 | third party advisory vendor advisory |