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GnuPG HTTP Keyserver Protocol Interface Format String Vulnerability
Secunia Advisory: SA10348
Release Date: 2003-12-04
Last Update: 2003-12-12
Popularity: 7,941 views

Critical:
Less critical
Impact: DoS
System access
Where: From remote
Solution Status: Vendor Patch

Software:GnuPG / gpg 1.2.x
GnuPG / gpg 1.3.x

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CVE reference:CVE-2003-0978


Description:
A vulnerability has been reported in GnuPG, which potentially can be exploited by malicious people to compromise a vulnerable system.

The vulnerability is caused due to a format string error in the HKP (HTTP Keyserver Protocol) interface used for retrieval of public keys from HKP keyservers. This can potentially be exploited by a malicious keyserver to execute arbitrary code on a vulnerable system.

The vulnerability has been reported in versions 1.2.3 and 1.3.3.

NOTE: The HKP interface is experimental and not enabled by default in the 1.2 branch.

Solution:
The vulnerability has been addressed in CVS for the 1.2 branch and in development version 1.3.4.

Secunia recommends that experimental functionality always is disabled on production systems.

Provided and/or discovered by:
Evgeny Legerov, S-Quadra.

Changelog:
2003-12-12: Added CVE reference.

Original Advisory:
GnuPG 1.2.3, 1.3.3 external HKP interface format string issue:
http://www.s-quadra.com/advisories/Adv-20031203.txt


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