SB2018103055 - Fedora 28 update for cabextract, libmspack

Description

This security bulletin contains information about 5 secuirty vulnerabilities.

1) Improper input validation (CVE-ID: CVE-2018-14680)

The vulnerability allows a local attacker to cause DoS condition on the target system.

The vulnerability exists due to the chmd_read_headers() function, as defined in the mspack/chmd.c source code file of the affected software, does not reject blank CHM filenames. A local attacker can submit a CHM file with a blank filename and cause the service to crash.

2) Stack-based buffer overflow (CVE-ID: CVE-2018-14681)

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The vulnerability exists due to stack-based buffer overflow in the kwajd_read_headers function, as defined in the mspack/kwajd.c source code file. A local attacker can send a specially crafted request that submits malicious input, trigger memory corruption and cause the service to crash or execute arbitrary code with elevated privileges.

Successful exploitation of the vulnerability may result in system compromise.

3) Stack-based buffer overflow (CVE-ID: CVE-2018-14682)

The vulnerability allows a local attacker to cause DoS condition on the target system.

The vulnerability exists due to stack-based buffer overflow in the tolower macro, as defined in the mspack/chmd.c source code file. A local attacker can send a specially crafted request that submits malicious input, trigger memory corruption and cause the service to crash.

4) Out-of-bounds write (CVE-ID: CVE-2018-18584)

The vulnerability allows a remote attacker to cause DoS condition or execute arbitrary code on the target system.

The vulnerability exists in the mspack/cab.h source code file due to Microsoft cabinet file (CAB) with a Quantum-compressed block of exactly 38,912 B will write 1 B beyond the end of the input buffer. when handling malicious input. A remote unauthenticated attacker can trick the victim into accessing of a CAB file that submits malicious input to the targeted system, trigger an out-of-bounds write condition and cause the application to crash or execute arbitrary code with elevated privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

5) Null pointer dereference (CVE-ID: CVE-2018-18585)

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to  the chmd_read_headers function, as defined in the mspack/chmd.c source code file of the affected software, accepts filenames that have embedded NULL bytes. A remote attacker can trick the victim into accessing a Compiled HTML (CHM) file that submits malicious input to the targeted system, trigger NULL pointer dereference and cause the service to crash.

Remediation

Install update from vendor's website.

References

• https://bodhi.fedoraproject.org/updates/FEDORA-2018-cb337fb199