Description
A VMSF_DELTA memory corruption was discovered in unrar before 5.5.5, as used in Sophos Anti-Virus Threat Detection Engine before 3.37.2 and other products, that can lead to arbitrary code execution. An integer overflow can be caused in DataSize+CurChannel. The result is a negative value of the "DestPos" variable, which allows the attacker to write out of bounds when setting Mem[DestPos].
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 | libclamunrar | 0.99-4 | — |
| Debian 14 | unrar-nonfree | 1:5.5.5-1 | — |
| Debian 13 | libclamunrar | 0.99-4 | — |
| Debian 13 | unrar-nonfree | 1:5.5.5-1 | — |
| Debian 12 | libclamunrar | 0.99-4 | — |
| Debian 12 | unrar-nonfree | 1:5.5.5-1 | — |
| Debian 7 | libclamunrar | 0.99-0+deb7u2 | DLA-1014-1 |
| Debian 7 | unrar-nonfree | 1:4.1.4-1+deb7u2 | DLA-1003-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | libclamunrar | 0.99-4ubuntu1 | — |
| Ubuntu 16.04 LTS | libclamunrar | 0.99-1ubuntu0.1 | — |
| Ubuntu 16.04 LTS | unrar-nonfree | 1:5.3.2-1+deb9u1build0.16.04.1 | — |
| Ubuntu 14.04 LTS | libclamunrar | 0.99-0ubuntu0.14.04.2 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
| SLES 12 SP4 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
| SLES 12 SP3 | clamav | 0.99.4-33.9.1 | SUSE-SU-2018:0809-1 |
| SLES 12 SP3 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
| SLES 12 SP2 | clamav | 0.99.2-32.1 | SUSE-SU-2018:0809-1, SUSE-SU-2017:1716-1 |
| SLES 12 SP2 | unrar | 5.0.14-3.1 | SUSE-SU-2021:2834-1, SUSE-SU-2017:1745-1 |
| SLES 12 SP1 | clamav | 0.99.2-32.1 | SUSE-SU-2017:1716-1 |
| SLES 12 SP1 | unrar | 5.0.14-3.1 | SUSE-SU-2017:1745-1 |
Show 15 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | clamav | 0.99.2-32.1 | SUSE-SU-2017:1716-1 |
| SLES 12 | unrar | 5.0.14-3.1 | SUSE-SU-2017:1745-1 |
| SLES 11 SP4 | clamav | 0.99.2-0.19.1 | SUSE-SU-2018:0863-1, SUSE-SU-2017:1763-1 |
| SLES 11 SP4 | unrar | 3.80.2-4.1 | SUSE-SU-2018:0862-1, SUSE-SU-2017:1760-1 |
| SLES 11 SP3 | clamav | 0.99.2-0.19.1 | SUSE-SU-2018:0863-1, SUSE-SU-2017:1763-1 |
| SLES 11 SP3 | unrar | 3.80.2-4.1 | SUSE-SU-2017:1760-1 |
| SLES for SAP 12 SP5 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
| SLES for SAP 12 SP4 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
| SLES for SAP 12 SP3 | clamav | 0.99.4-33.9.1 | SUSE-SU-2018:0809-1 |
| SLES for SAP 12 SP3 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
| SLES for SAP 12 SP2 | clamav | 0.99.2-32.1 | SUSE-SU-2018:0809-1, SUSE-SU-2017:1716-1 |
| SLES for SAP 12 SP2 | unrar | 5.0.14-3.1 | SUSE-SU-2017:1745-1 |
| SLES for SAP 12 SP1 | clamav | 0.99.2-32.1 | SUSE-SU-2017:1716-1 |
| SLES for SAP 12 SP1 | unrar | 5.0.14-3.1 | SUSE-SU-2017:1745-1 |
| SLES for SAP 12 | clamav | 0.99.2-32.1 | SUSE-SU-2017:1716-1 |
| SLES for SAP 12 | unrar | 5.0.14-3.1 | SUSE-SU-2017:1745-1 |
| SLES for SAP 11 SP4 | clamav | 0.99.2-0.19.1 | SUSE-SU-2018:0863-1, SUSE-SU-2017:1763-1 |
| SLES for SAP 11 SP4 | unrar | 3.80.2-4.1 | SUSE-SU-2018:0862-1, SUSE-SU-2017:1760-1 |
| SUSE OpenStack Cloud Crowbar 9 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
| SUSE OpenStack Cloud 9 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
| SUSE OpenStack Cloud 8 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
| SUSE OpenStack Cloud 6 | unrar | 5.0.14-3.1 | SUSE-SU-2017:1745-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | clamav | 0.99.2-0.19.1 | SUSE-SU-2018:0863-1, SUSE-SU-2017:1763-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | unrar | 3.80.2-4.1 | SUSE-SU-2017:1760-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | clamav | 0.103.3-1.4 | openSUSE-SU-2024:10685-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | clamav | 0.99.4-r0 | — |
| Alpine v3.23 | clamav | 0.99.4-r0 | — |
| Alpine v3.22 | clamav | 0.99.4-r0 | — |
| Alpine v3.21 | clamav | 0.99.4-r0 | — |
| Alpine v3.20 | clamav | 0.99.4-r0 | — |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | clamav | 0.99.4-r0 | — |
| Alpine v3.18 | clamav | 0.99.4-r0 | — |
| Alpine v3.17 | clamav | 0.99.4-r0 | — |
| Alpine v3.16 | clamav | 0.99.4-r0 | — |
| Alpine v3.15 | clamav | 0.99.4-r0 | — |
| Alpine v3.14 | clamav | 0.99.4-r0 | — |
| Alpine v3.13 | clamav | 0.99.4-r0 | — |
| Alpine v3.12 | clamav | 0.99.4-r0 | — |
| Alpine v3.11 | clamav | 0.99.4-r0 | — |
| Alpine v3.10 | clamav | 0.99.4-r0 | — |
| Alpine v3.9 | clamav | 0.99.4-r0 | — |
| Alpine v3.8 | clamav | 0.99.4-r0 | — |
Advisories 11
- DLA-1014-1 libclamunrar - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1003-1 unrar-nonfree - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2017:1763-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1745-1 Security update for unrar SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1760-1 Security update for unrar SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10685-1 clamav-0.103.3-1.4 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0863-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2834-1 Security update for unrar SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0809-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1716-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0862-1 Security update for unrar SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1286
- https://nakedsecurity.sophos.com/2012/11/05/tavis-ormandy-sophos/
- GLSA-201709-24 vendor-advisory
- https://community.sophos.com/kb/en-us/118424#six
- GLSA-201708-05 vendor-advisory
- https://lock.cmpxchg8b.com/sophailv2.pdf
- GLSA-201804-16 vendor-advisory
- https://kc.mcafee.com/corporate/index?page=content&id=SB10205
- http://telussecuritylabs.com/threats/show/TSL20121207-01
- http://securitytracker.com/id?1027725