Description
The _ssl_verify_callback function in tls_nb.py in Gajim before 0.15.3 does not properly verify SSL certificates, which allows remote attackers to conduct man-in-the-middle (MITM) attacks and spoof servers via an arbitrary certificate from a trusted CA.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | gajim | 0.15.4-1 | — |
| Debian 13 | gajim | 0.15.4-1 | — |
| Debian 12 | gajim | 0.15.4-1 | — |