CVE-2018-18584
Published: 22 October 2018
In mspack/cab.h in libmspack before 0.8alpha and cabextract before 1.8, the CAB block input buffer is one byte too small for the maximal Quantum block, leading to an out-of-bounds write.
From the Ubuntu Security Team
It was discovered that cabextract incorrectly handled certain malformed CAB files. A remote attacker could use this issue to cause cabextract to crash, resulting in a denial of service.
Notes
| Author | Note |
|---|---|
| alexmurray | We released clamav 0.100.2+dfsg-1ubuntu0.1X.04.2 for precise/esm and trusty, but subsequently were notified the bundled libmspack is not actually vulnerable in this case, as the version of libmspack provided had increased the CAB_BLOCKMAX macro to 65535, meaning that CAB_INPUTMAX is now 71679, which is impossible to encode in the 16-bit cfdata_CompressedSize field of a single block. |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
cabextract Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(uses system libmspack)
|
| cosmic |
Not vulnerable
(uses system libmspack)
|
|
| disco |
Not vulnerable
(uses system libmspack)
|
|
| eoan |
Not vulnerable
(uses system libmspack)
|
|
| focal |
Not vulnerable
(uses system libmspack)
|
|
| groovy |
Not vulnerable
(uses system libmspack)
|
|
| hirsute |
Not vulnerable
(uses system libmspack)
|
|
| impish |
Not vulnerable
(uses system libmspack)
|
|
| jammy |
Not vulnerable
(uses system libmspack)
|
|
| precise |
Does not exist
|
|
| trusty |
Released
(1.4-4ubuntu0.1~esm1)
|
|
| upstream |
Released
(1.4-5)
|
|
| xenial |
Not vulnerable
(uses system libmspack)
|
|
|
clamav Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(uses system libmspack)
|
| cosmic |
Not vulnerable
(uses system libmspack)
|
|
| disco |
Not vulnerable
(uses system libmspack)
|
|
| eoan |
Not vulnerable
(uses system libmspack)
|
|
| focal |
Not vulnerable
(uses system libmspack)
|
|
| groovy |
Not vulnerable
(uses system libmspack)
|
|
| hirsute |
Not vulnerable
(uses system libmspack)
|
|
| impish |
Not vulnerable
(uses system libmspack)
|
|
| jammy |
Not vulnerable
(uses system libmspack)
|
|
| precise |
Released
(0.100.2+dfsg-1ubuntu0.12.04.2)
|
|
| trusty |
Released
(0.100.2+dfsg-1ubuntu0.14.04.2)
|
|
| upstream |
Needs triage
|
|
| xenial |
Not vulnerable
(uses system libmspack)
|
|
|
libmspack Launchpad, Ubuntu, Debian |
bionic |
Released
(0.6-3ubuntu0.2)
|
| cosmic |
Released
(0.7-1ubuntu0.1)
|
|
| disco |
Not vulnerable
(0.9.1-1)
|
|
| eoan |
Not vulnerable
(0.9.1-1)
|
|
| focal |
Not vulnerable
(0.9.1-1)
|
|
| groovy |
Not vulnerable
(0.9.1-1)
|
|
| hirsute |
Not vulnerable
(0.9.1-1)
|
|
| impish |
Not vulnerable
(0.9.1-1)
|
|
| jammy |
Not vulnerable
(0.9.1-1)
|
|
| precise |
Does not exist
|
|
| trusty |
Released
(0.4-1ubuntu0.1~esm1)
|
|
| upstream |
Needs triage
|
|
| xenial |
Released
(0.5-1ubuntu0.16.04.3)
|
|
|
Patches: upstream: https://github.com/kyz/libmspack/commit/40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.5 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-18584
- https://www.openwall.com/lists/oss-security/2018/10/22/1
- https://www.cabextract.org.uk/#changes
- https://ubuntu.com/security/notices/USN-3814-1
- https://ubuntu.com/security/notices/USN-3814-2
- https://ubuntu.com/security/notices/USN-3814-3
- NVD
- Launchpad
- Debian