Irssi before 1.0.5, while waiting for the channel synchronisation, may incorrectly fail to remove destroyed channels from the query list, resulting in use-after-free conditions when updating the state later on.
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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://www.debian.org/security/2017/dsa-4016 | vendor advisory |
| https://lists.debian.org/debian-lts-announce/2017/12/msg00022.html | mailing list |
| https://irssi.org/security/irssi_sa_2017_10.txt | patch vendor advisory mitigation |
| http://openwall.com/lists/oss-security/2017/10/22/4 | patch mailing list mitigation third party advisory |