Jakub Wilk discovered that unace, an utility to extract, test and view .ace archives, contained an integer overflow leading to a buffer overflow. If a user or automated system were tricked into processing a specially crafted ace archive, an attacker could cause a denial of service (application crash) or, possibly, execute arbitrary code.
For the stable distribution (wheezy), this problem has been fixed in version 1.2b-10+deb7u1.
For the upcoming stable distribution (jessie), this problem has been fixed in version 1.2b-12.
For the unstable distribution (sid), this problem has been fixed in version 1.2b-12.
We recommend that you upgrade your unace packages.