Description
An issue was discovered in mspack/chmd.c in libmspack before 0.7alpha. There is an off-by-one error in the TOLOWER() macro for CHM decompression.
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 | libmspack | 0.7-1 | — |
| Debian 13 | libmspack | 0.7-1 | — |
| Debian 12 | libmspack | 0.7-1 | — |
| Debian 9 | libmspack | 0.5-1+deb9u2 | DSA-4260-1 |
| Debian 8 | libmspack | 0.5-1+deb8u2 | DLA-1460-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | libmspack | 0.6-3ubuntu0.1 | USN-3728-1 |
| Ubuntu 16.04 LTS | libmspack | 0.5-1ubuntu0.16.04.2 | USN-3728-1 |
| Ubuntu 14.04 LTS | clamav | 0.100.1+dfsg-1ubuntu0.14.04.3 | USN-3728-2 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | libmspack | 0.4-1ubuntu0.1~esm2 | USN-7788-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | libmspack +1 | 0.5-0.6.alpha.el7 | RHSA-2018:3327 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | libmspack | 0.6-3.11.1 | SUSE-SU-2021:2802-1 |
| SLES 15 SP2 | libmspack | 0.6-3.11.1 | SUSE-SU-2021:2802-1 |
| SLES 15 | clamav | 0.100.2-3.6.4 | SUSE-SU-2018:3250-1 |
| SLES 12 SP5 | libmspack | 0.4-15.10.1 | SUSE-SU-2021:2765-1 |
| SLES 12 SP3 | clamav | 0.100.2-33.18.1 | SUSE-SU-2018:3436-1 |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | clamav | 0.100.2-33.18.1 | SUSE-SU-2018:3436-1 |
| SLES 12 SP1 | clamav | 0.100.2-33.18.1 | SUSE-SU-2018:3436-1 |
| SLES 12 | clamav | 0.100.2-33.18.1 | SUSE-SU-2018:3436-1 |
| SLES 11 SP4 | clamav | 0.100.2-0.20.18.1 | SUSE-SU-2018:3441-1 |
| SLES 11 SP3 | clamav | 0.100.2-0.20.18.1 | SUSE-SU-2018:3441-1 |
| SLES for SAP 12 SP5 | libmspack | 0.4-15.10.1 | SUSE-SU-2021:2765-1 |
| SLES for SAP 12 SP3 | clamav | 0.100.2-33.18.1 | SUSE-SU-2018:3436-1 |
| SLES for SAP 12 SP2 | clamav | 0.100.2-33.18.1 | SUSE-SU-2018:3436-1 |
| SLES for SAP 12 SP1 | clamav | 0.100.2-33.18.1 | SUSE-SU-2018:3436-2 |
| SLES for SAP 11 SP4 | clamav | 0.100.2-0.20.18.1 | SUSE-SU-2018:3441-1 |
| SLE Micro 5.0 | libmspack | 0.6-3.11.1 | SUSE-SU-2021:2802-1 |
| SUSE OpenStack Cloud 7 | clamav | 0.100.2-33.18.1 | SUSE-SU-2018:3436-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | clamav | 0.100.2-0.20.18.1 | SUSE-SU-2018:3441-1 |
| SUSE Enterprise Storage 4 | clamav | 0.100.2-33.18.1 | SUSE-SU-2018:3436-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | libmspack | 0.6-3.11.1 | openSUSE-SU-2021:2802-1 |
| openSUSE Leap 15.2 | libmspack | 0.6-lp152.6.3.1 | openSUSE-SU-2021:1200-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | clamav | 0.100.2-r0 | — |
| Alpine v3.24 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.23 | clamav | 0.100.2-r0 | — |
| Alpine v3.23 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.22 | clamav | 0.100.2-r0 | — |
| Alpine v3.22 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.21 | clamav | 0.100.2-r0 | — |
| Alpine v3.21 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.20 | clamav | 0.100.2-r0 | — |
| Alpine v3.20 | libmspack | 0.7.1_alpha-r0 | — |
Show 15 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | clamav | 0.100.2-r0 | — |
| Alpine v3.19 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.18 | clamav | 0.100.2-r0 | — |
| Alpine v3.18 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.17 | clamav | 0.100.2-r0 | — |
| Alpine v3.17 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.16 | clamav | 0.100.2-r0 | — |
| Alpine v3.16 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.15 | clamav | 0.100.2-r0 | — |
| Alpine v3.15 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.14 | clamav | 0.100.2-r0 | — |
| Alpine v3.14 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.13 | clamav | 0.100.2-r0 | — |
| Alpine v3.13 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.12 | clamav | 0.100.2-r0 | — |
| Alpine v3.12 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.11 | clamav | 0.100.2-r0 | — |
| Alpine v3.11 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.10 | clamav | 0.100.2-r0 | — |
| Alpine v3.10 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.9 | clamav | 0.100.2-r0 | — |
| Alpine v3.9 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.8 | clamav | 0.100.2-r0 | — |
| Alpine v3.8 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.7 | clamav | 0.100.2-r0 | — |
| Alpine v3.7 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.6 | clamav | 0.100.2-r0 | — |
| Alpine v3.6 | libmspack | 0.7.1_alpha-r0 | — |
| Alpine v3.5 | libmspack | 0.7.1_alpha-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | libmspack +1 | 0.5-0.6.alpha.amzn2.0.1 | ALAS2-2019-1152 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | libmspack +1 | 0.5-0.6.alpha.el7 | ELSA-2018-3327 |
Advisories 17
- RHSA-2018:3327 Red Hat Security Advisory: libmspack security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-7788-1 libmspack vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3728-1 libmspack vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3728-2 clamav vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4260-1 libmspack - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1460-1 libmspack - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2021:1200-1 Security update for libmspack SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:2802-1 Security update for libmspack SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3441-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3436-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2802-1 Security update for libmspack SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3436-2 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2765-1 Security update for libmspack SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3250-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-0249 ClamAV: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Feb 3, 2025
- ALAS2-2019-1152 Low: libmspack security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 25, 2019
- ELSA-2018-3327 Low: libmspack security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 5, 2018
References
- USN-3728-3 vendor-advisory
- DSA-4260 vendor-advisory
- [debian-lts-announce] 20180806 [SECURITY] [DLA-1460-1] libmspack security update mailing-list
- https://bugs.debian.org/904800
- http://www.openwall.com/lists/oss-security/2018/07/26/1
- RHSA-2018:3505 vendor-advisory
- USN-3789-2 vendor-advisory
- USN-3728-2 vendor-advisory
- 1041410 vdb-entry
- https://github.com/kyz/libmspack/commit/4fd9ccaa54e1aebde1e4b95fb0163b699fd7bcc8
- USN-3728-1 vendor-advisory
- RHSA-2018:3327 vendor-advisory
- GLSA-201903-20 vendor-advisory