CVE-2017-11423 Amazon Linux Security Advisory for clamav: ALAS-2018-976

Heap-based buffer overflow in mspack/lzxd.cmspack/lzxd.c in libmspack 0.5alpha, as used in ClamAV 0.99.2, allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted CHM file. (CVE-2017-6419 )

Out-of-bounds access in the PDF parser (CVE-2018-0202 )

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]. (CVE-2012-6706 )

ClamAV version version 0.99.3 contains a Out of bounds heap memory read vulnerability in XAR parser, function xar_hash_check() that can result in Leaking of memory, may help in developing exploit chains.. This attack appear to be exploitable via The victim must scan a crafted XAR file. (CVE-2018-1000085 )

Stack-based buffer over-read in cabd_read_string functionThe cabd_read_string function in mspack/cabd.c in libmspack 0.5alpha, as used in ClamAV 0.99.2 and other products, allows remote attackers to cause a denial of service (stack-based buffer over-read and application crash) via a crafted CAB file. (CVE-2017-11423 )

Allows unauthorized disclosure of information; allows unauthorized modification; allows disruption of service.

Please refer to Amazon advisory ALAS-2018-976 for affected packages and patching details, or update with your package manager.

Patch:
Following are links for downloading patches to fix the vulnerabilities:

ALAS-2018-976: Amazon Linux (clamav (0.99.4-1.29.amzn1) on noarch)

ALAS-2018-976: Amazon Linux (clamav (0.99.4-1.29.amzn1) on x86_64)

ALAS-2018-976: Amazon Linux (clamav (0.99.4-1.29.amzn1) on src)

ALAS-2018-976: Amazon Linux (clamav (0.99.4-1.29.amzn1) on i686)