Vulnerability CVE-2017-17805


Published: 2017-12-20

Description:
The Salsa20 encryption algorithm in the Linux kernel before 4.14.8 does not correctly handle zero-length inputs, allowing a local attacker able to use the AF_ALG-based skcipher interface (CONFIG_CRYPTO_USER_API_SKCIPHER) to cause a denial of service (uninitialized-memory free and kernel crash) or have unspecified other impact by executing a crafted sequence of system calls that use the blkcipher_walk API. Both the generic implementation (crypto/salsa20_generic.c) and x86 implementation (arch/x86/crypto/salsa20_glue.c) of Salsa20 were vulnerable.

Type:

CWE-20

(Improper Input Validation)

CVSS2 => (AV:L/AC:L/Au:N/C:C/I:C/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.2/10
10/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete
Affected software
SUSE -> Linux enterprise desktop 
SUSE -> Linux enterprise server 
SUSE -> Linux enterprise server for raspberry pi 
Opensuse project -> LEAP 
Opensuse -> LEAP 
Linux -> Linux kernel 
Debian -> Debian linux 

 References:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ecaaab5649781c5a0effdaf298a925063020500e
http://lists.opensuse.org/opensuse-security-announce/2018-01/msg00006.html
http://lists.opensuse.org/opensuse-security-announce/2018-01/msg00007.html
http://lists.opensuse.org/opensuse-security-announce/2018-01/msg00008.html
http://lists.opensuse.org/opensuse-security-announce/2018-01/msg00014.html
http://lists.opensuse.org/opensuse-security-announce/2018-01/msg00016.html
http://www.securityfocus.com/bid/102291
https://access.redhat.com/errata/RHSA-2018:2948
https://access.redhat.com/errata/RHSA-2018:3083
https://access.redhat.com/errata/RHSA-2018:3096
https://github.com/torvalds/linux/commit/ecaaab5649781c5a0effdaf298a925063020500e
https://lists.debian.org/debian-lts-announce/2018/01/msg00004.html
https://usn.ubuntu.com/3617-1/
https://usn.ubuntu.com/3617-2/
https://usn.ubuntu.com/3617-3/
https://usn.ubuntu.com/3619-1/
https://usn.ubuntu.com/3619-2/
https://usn.ubuntu.com/3620-1/
https://usn.ubuntu.com/3620-2/
https://usn.ubuntu.com/3632-1/
https://www.debian.org/security/2017/dsa-4073
https://www.debian.org/security/2018/dsa-4082
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.8

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