Title: 'libspf2' DNS TXT Record Handling Remote Buffer Overflow Vulnerability
Severity: HIGH
Description:
The 'libspf2' library is used to implement the Sender Policy Framework (SPF).
The library is prone to a remote buffer-overflow vulnerability that stems from a lack of bounds checking when handling specially crafted DNS TXT records. Specifically, the vulnerability resides in the 'SPF_dns_resolv_lookup()' function of the 'Spf_dns_resolv.c' file and occurs because of improper validation of a length field.
Remote attackers may exploit this issue to execute arbitrary code in the context of an application using a vulnerable version of the library. Note that an attacker would need to be in control of a malicious DNS server or carry out a man-in-the-middle attack to leverage this vulnerability.
Versions prior to 'libspf2' 1.2.8 are affected.
Affected Products:
- Astaro Security Gateway 7
- Debian Linux 4.0
- Debian Linux 4.0 alpha
- Debian Linux 4.0 amd64
- Debian Linux 4.0 arm
- Debian Linux 4.0 hppa
- Debian Linux 4.0 ia-32
- Debian Linux 4.0 ia-64
- Debian Linux 4.0 m68k
- Debian Linux 4.0 mips
- Debian Linux 4.0 mipsel
- Debian Linux 4.0 powerpc
- Debian Linux 4.0 s/390
- Debian Linux 4.0 sparc
- Gentoo Linux
- libspf2 libspf2 1.2.1
- libspf2 libspf2 1.2.2
- libspf2 libspf2 1.2.3
- libspf2 libspf2 1.2.4
- libspf2 libspf2 1.2.5
- libspf2 libspf2 1.2.6
- libspf2 libspf2 1.2.7
References:
- Astaro: Up2Date 7.305 Released
- Dan Kaminsky: DNS TXT Record Parsing Bug in LibSPF2
- Robert Buchholz: Bug 242254 - mail-filter/libspf2 <1.2.8 DNS response buffer overflow
- US-CERT: Vulnerability Note VU#183657 libspf2 DNS TXT record parsing buffer overflow
- libspf2: libspf2 SPF Library Home Page
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