[arch-security] [ASA-201708-13] strongswan: denial of service
Chris.Rebischke at archlinux.org
Tue Aug 15 12:01:53 UTC 2017
Arch Linux Security Advisory ASA-201708-13
Date : 2017-08-14
CVE-ID : CVE-2017-11185
Package : strongswan
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-382
The package strongswan before version 5.5.3-4 is vulnerable to denial
Upgrade to 5.5.3-4.
# pacman -Syu "strongswan>=5.5.3-4"
The problem has been fixed upstream but no release is available yet.
Fixed a DoS vulnerability in the gmp plugin that was caused by
insufficient input validation when verifying RSA signatures, which
requires decryption with the operation m^e mod n, where m is the
signature, and e and n are the exponent and modulus of the public key.
The value m is an integer between 0 and n-1, however, the gmp plugin
did not verify this. So if m equals n the calculation results in 0, in
which case mpz_export() returns NULL. This result wasn't handled
properly causing a null-pointer dereference.
The attacker is able to crash the application via a specially crafted
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