Description
Tor before 0.3.5.10, 0.4.x before 0.4.1.9, and 0.4.2.x before 0.4.2.7 allows remote attackers to cause a Denial of Service (memory leak), aka TROVE-2020-004. This occurs in circpad_setup_machine_on_circ because a circuit-padding machine can be negotiated twice on the same circuit.
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 | tor | 0.4.2.7-1 | — |
| Debian 13 | tor | 0.4.2.7-1 | — |
| Debian 12 | tor | 0.4.2.7-1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP2 | tor | 0.4.4.6-bp152.2.3.1 | openSUSE-SU-2020:1970-1 |
| SUSE Package Hub 15 SP1 | tor | 0.3.5.10-bp151.3.3.1 | openSUSE-SU-2020:1970-1, openSUSE-SU-2020:0428-1 |
| SUSE Package Hub 12 | tor | 0.4.4.6-bp152.2.3.1 | openSUSE-SU-2020:1970-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tor | 0.4.6.7-2.2 | openSUSE-SU-2024:11469-1 |
| openSUSE Leap 15.2 | tor | 0.4.4.6-bp152.2.3.1 | openSUSE-SU-2020:1970-1 |
| openSUSE Leap 15.1 | tor | 0.3.5.10-lp151.2.3.1 | openSUSE-SU-2020:1970-1, openSUSE-SU-2020:0406-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | tor | 0.4.2.7-r0 | — |
| Alpine v3.23 | tor | 0.4.2.7-r0 | — |
| Alpine v3.22 | tor | 0.4.2.7-r0 | — |
| Alpine v3.21 | tor | 0.4.2.7-r0 | — |
| Alpine v3.20 | tor | 0.4.2.7-r0 | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | tor | 0.4.2.7-r0 | — |
| Alpine v3.18 | tor | 0.4.2.7-r0 | — |
| Alpine v3.17 | tor | 0.4.2.7-r0 | — |
| Alpine v3.16 | tor | 0.4.2.7-r0 | — |
| Alpine v3.15 | tor | 0.4.2.7-r0 | — |
| Alpine v3.14 | tor | 0.4.2.7-r0 | — |
| Alpine v3.13 | tor | 0.4.2.7-r0 | — |
| Alpine v3.12 | tor | 0.4.2.7-r0 | — |
| Alpine v3.11 | tor | 0.4.4.9-r0 | — |
| Alpine v3.10 | tor | 0.3.5.10-r0 | — |
Advisories 4
- openSUSE-SU-2020:0428-1 Security update for tor SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11469-1 tor-0.4.6.7-2.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1970-1 Security update for tor SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0406-1 Security update for tor SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://trac.torproject.org/projects/tor/ticket/33619
- GLSA-202003-50 vendor-advisory
- openSUSE-SU-2020:0406 vendor-advisory
- openSUSE-SU-2020:0428 vendor-advisory